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wp-includes/js/dist/vendor/regenerator-runtime.js

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+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+var runtime = (function (exports) {
+  "use strict";
+
+  var Op = Object.prototype;
+  var hasOwn = Op.hasOwnProperty;
+  var defineProperty = Object.defineProperty || function (obj, key, desc) { obj[key] = desc.value; };
+  var undefined; // More compressible than void 0.
+  var $Symbol = typeof Symbol === "function" ? Symbol : {};
+  var iteratorSymbol = $Symbol.iterator || "@@iterator";
+  var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
+  var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";
+
+  function define(obj, key, value) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+    return obj[key];
+  }
+  try {
+    // IE 8 has a broken Object.defineProperty that only works on DOM objects.
+    define({}, "");
+  } catch (err) {
+    define = function(obj, key, value) {
+      return obj[key] = value;
+    };
+  }
+
+  function wrap(innerFn, outerFn, self, tryLocsList) {
+    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
+    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
+    var generator = Object.create(protoGenerator.prototype);
+    var context = new Context(tryLocsList || []);
+
+    // The ._invoke method unifies the implementations of the .next,
+    // .throw, and .return methods.
+    defineProperty(generator, "_invoke", { value: makeInvokeMethod(innerFn, self, context) });
+
+    return generator;
+  }
+  exports.wrap = wrap;
+
+  // Try/catch helper to minimize deoptimizations. Returns a completion
+  // record like context.tryEntries[i].completion. This interface could
+  // have been (and was previously) designed to take a closure to be
+  // invoked without arguments, but in all the cases we care about we
+  // already have an existing method we want to call, so there's no need
+  // to create a new function object. We can even get away with assuming
+  // the method takes exactly one argument, since that happens to be true
+  // in every case, so we don't have to touch the arguments object. The
+  // only additional allocation required is the completion record, which
+  // has a stable shape and so hopefully should be cheap to allocate.
+  function tryCatch(fn, obj, arg) {
+    try {
+      return { type: "normal", arg: fn.call(obj, arg) };
+    } catch (err) {
+      return { type: "throw", arg: err };
+    }
+  }
+
+  var GenStateSuspendedStart = "suspendedStart";
+  var GenStateSuspendedYield = "suspendedYield";
+  var GenStateExecuting = "executing";
+  var GenStateCompleted = "completed";
+
+  // Returning this object from the innerFn has the same effect as
+  // breaking out of the dispatch switch statement.
+  var ContinueSentinel = {};
+
+  // Dummy constructor functions that we use as the .constructor and
+  // .constructor.prototype properties for functions that return Generator
+  // objects. For full spec compliance, you may wish to configure your
+  // minifier not to mangle the names of these two functions.
+  function Generator() {}
+  function GeneratorFunction() {}
+  function GeneratorFunctionPrototype() {}
+
+  // This is a polyfill for %IteratorPrototype% for environments that
+  // don't natively support it.
+  var IteratorPrototype = {};
+  define(IteratorPrototype, iteratorSymbol, function () {
+    return this;
+  });
+
+  var getProto = Object.getPrototypeOf;
+  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
+  if (NativeIteratorPrototype &&
+      NativeIteratorPrototype !== Op &&
+      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
+    // This environment has a native %IteratorPrototype%; use it instead
+    // of the polyfill.
+    IteratorPrototype = NativeIteratorPrototype;
+  }
+
+  var Gp = GeneratorFunctionPrototype.prototype =
+    Generator.prototype = Object.create(IteratorPrototype);
+  GeneratorFunction.prototype = GeneratorFunctionPrototype;
+  defineProperty(Gp, "constructor", { value: GeneratorFunctionPrototype, configurable: true });
+  defineProperty(
+    GeneratorFunctionPrototype,
+    "constructor",
+    { value: GeneratorFunction, configurable: true }
+  );
+  GeneratorFunction.displayName = define(
+    GeneratorFunctionPrototype,
+    toStringTagSymbol,
+    "GeneratorFunction"
+  );
+
+  // Helper for defining the .next, .throw, and .return methods of the
+  // Iterator interface in terms of a single ._invoke method.
+  function defineIteratorMethods(prototype) {
+    ["next", "throw", "return"].forEach(function(method) {
+      define(prototype, method, function(arg) {
+        return this._invoke(method, arg);
+      });
+    });
+  }
+
+  exports.isGeneratorFunction = function(genFun) {
+    var ctor = typeof genFun === "function" && genFun.constructor;
+    return ctor
+      ? ctor === GeneratorFunction ||
+        // For the native GeneratorFunction constructor, the best we can
+        // do is to check its .name property.
+        (ctor.displayName || ctor.name) === "GeneratorFunction"
+      : false;
+  };
+
+  exports.mark = function(genFun) {
+    if (Object.setPrototypeOf) {
+      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
+    } else {
+      genFun.__proto__ = GeneratorFunctionPrototype;
+      define(genFun, toStringTagSymbol, "GeneratorFunction");
+    }
+    genFun.prototype = Object.create(Gp);
+    return genFun;
+  };
+
+  // Within the body of any async function, `await x` is transformed to
+  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
+  // `hasOwn.call(value, "__await")` to determine if the yielded value is
+  // meant to be awaited.
+  exports.awrap = function(arg) {
+    return { __await: arg };
+  };
+
+  function AsyncIterator(generator, PromiseImpl) {
+    function invoke(method, arg, resolve, reject) {
+      var record = tryCatch(generator[method], generator, arg);
+      if (record.type === "throw") {
+        reject(record.arg);
+      } else {
+        var result = record.arg;
+        var value = result.value;
+        if (value &&
+            typeof value === "object" &&
+            hasOwn.call(value, "__await")) {
+          return PromiseImpl.resolve(value.__await).then(function(value) {
+            invoke("next", value, resolve, reject);
+          }, function(err) {
+            invoke("throw", err, resolve, reject);
+          });
+        }
+
+        return PromiseImpl.resolve(value).then(function(unwrapped) {
+          // When a yielded Promise is resolved, its final value becomes
+          // the .value of the Promise<{value,done}> result for the
+          // current iteration.
+          result.value = unwrapped;
+          resolve(result);
+        }, function(error) {
+          // If a rejected Promise was yielded, throw the rejection back
+          // into the async generator function so it can be handled there.
+          return invoke("throw", error, resolve, reject);
+        });
+      }
+    }
+
+    var previousPromise;
+
+    function enqueue(method, arg) {
+      function callInvokeWithMethodAndArg() {
+        return new PromiseImpl(function(resolve, reject) {
+          invoke(method, arg, resolve, reject);
+        });
+      }
+
+      return previousPromise =
+        // If enqueue has been called before, then we want to wait until
+        // all previous Promises have been resolved before calling invoke,
+        // so that results are always delivered in the correct order. If
+        // enqueue has not been called before, then it is important to
+        // call invoke immediately, without waiting on a callback to fire,
+        // so that the async generator function has the opportunity to do
+        // any necessary setup in a predictable way. This predictability
+        // is why the Promise constructor synchronously invokes its
+        // executor callback, and why async functions synchronously
+        // execute code before the first await. Since we implement simple
+        // async functions in terms of async generators, it is especially
+        // important to get this right, even though it requires care.
+        previousPromise ? previousPromise.then(
+          callInvokeWithMethodAndArg,
+          // Avoid propagating failures to Promises returned by later
+          // invocations of the iterator.
+          callInvokeWithMethodAndArg
+        ) : callInvokeWithMethodAndArg();
+    }
+
+    // Define the unified helper method that is used to implement .next,
+    // .throw, and .return (see defineIteratorMethods).
+    defineProperty(this, "_invoke", { value: enqueue });
+  }
+
+  defineIteratorMethods(AsyncIterator.prototype);
+  define(AsyncIterator.prototype, asyncIteratorSymbol, function () {
+    return this;
+  });
+  exports.AsyncIterator = AsyncIterator;
+
+  // Note that simple async functions are implemented on top of
+  // AsyncIterator objects; they just return a Promise for the value of
+  // the final result produced by the iterator.
+  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {
+    if (PromiseImpl === void 0) PromiseImpl = Promise;
+
+    var iter = new AsyncIterator(
+      wrap(innerFn, outerFn, self, tryLocsList),
+      PromiseImpl
+    );
+
+    return exports.isGeneratorFunction(outerFn)
+      ? iter // If outerFn is a generator, return the full iterator.
+      : iter.next().then(function(result) {
+          return result.done ? result.value : iter.next();
+        });
+  };
+
+  function makeInvokeMethod(innerFn, self, context) {
+    var state = GenStateSuspendedStart;
+
+    return function invoke(method, arg) {
+      if (state === GenStateExecuting) {
+        throw new Error("Generator is already running");
+      }
+
+      if (state === GenStateCompleted) {
+        if (method === "throw") {
+          throw arg;
+        }
+
+        // Be forgiving, per 25.3.3.3.3 of the spec:
+        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
+        return doneResult();
+      }
+
+      context.method = method;
+      context.arg = arg;
+
+      while (true) {
+        var delegate = context.delegate;
+        if (delegate) {
+          var delegateResult = maybeInvokeDelegate(delegate, context);
+          if (delegateResult) {
+            if (delegateResult === ContinueSentinel) continue;
+            return delegateResult;
+          }
+        }
+
+        if (context.method === "next") {
+          // Setting context._sent for legacy support of Babel's
+          // function.sent implementation.
+          context.sent = context._sent = context.arg;
+
+        } else if (context.method === "throw") {
+          if (state === GenStateSuspendedStart) {
+            state = GenStateCompleted;
+            throw context.arg;
+          }
+
+          context.dispatchException(context.arg);
+
+        } else if (context.method === "return") {
+          context.abrupt("return", context.arg);
+        }
+
+        state = GenStateExecuting;
+
+        var record = tryCatch(innerFn, self, context);
+        if (record.type === "normal") {
+          // If an exception is thrown from innerFn, we leave state ===
+          // GenStateExecuting and loop back for another invocation.
+          state = context.done
+            ? GenStateCompleted
+            : GenStateSuspendedYield;
+
+          if (record.arg === ContinueSentinel) {
+            continue;
+          }
+
+          return {
+            value: record.arg,
+            done: context.done
+          };
+
+        } else if (record.type === "throw") {
+          state = GenStateCompleted;
+          // Dispatch the exception by looping back around to the
+          // context.dispatchException(context.arg) call above.
+          context.method = "throw";
+          context.arg = record.arg;
+        }
+      }
+    };
+  }
+
+  // Call delegate.iterator[context.method](context.arg) and handle the
+  // result, either by returning a { value, done } result from the
+  // delegate iterator, or by modifying context.method and context.arg,
+  // setting context.delegate to null, and returning the ContinueSentinel.
+  function maybeInvokeDelegate(delegate, context) {
+    var methodName = context.method;
+    var method = delegate.iterator[methodName];
+    if (method === undefined) {
+      // A .throw or .return when the delegate iterator has no .throw
+      // method, or a missing .next mehtod, always terminate the
+      // yield* loop.
+      context.delegate = null;
+
+      // Note: ["return"] must be used for ES3 parsing compatibility.
+      if (methodName === "throw" && delegate.iterator["return"]) {
+        // If the delegate iterator has a return method, give it a
+        // chance to clean up.
+        context.method = "return";
+        context.arg = undefined;
+        maybeInvokeDelegate(delegate, context);
+
+        if (context.method === "throw") {
+          // If maybeInvokeDelegate(context) changed context.method from
+          // "return" to "throw", let that override the TypeError below.
+          return ContinueSentinel;
+        }
+      }
+      if (methodName !== "return") {
+        context.method = "throw";
+        context.arg = new TypeError(
+          "The iterator does not provide a '" + methodName + "' method");
+      }
+
+      return ContinueSentinel;
+    }
+
+    var record = tryCatch(method, delegate.iterator, context.arg);
+
+    if (record.type === "throw") {
+      context.method = "throw";
+      context.arg = record.arg;
+      context.delegate = null;
+      return ContinueSentinel;
+    }
+
+    var info = record.arg;
+
+    if (! info) {
+      context.method = "throw";
+      context.arg = new TypeError("iterator result is not an object");
+      context.delegate = null;
+      return ContinueSentinel;
+    }
+
+    if (info.done) {
+      // Assign the result of the finished delegate to the temporary
+      // variable specified by delegate.resultName (see delegateYield).
+      context[delegate.resultName] = info.value;
+
+      // Resume execution at the desired location (see delegateYield).
+      context.next = delegate.nextLoc;
+
+      // If context.method was "throw" but the delegate handled the
+      // exception, let the outer generator proceed normally. If
+      // context.method was "next", forget context.arg since it has been
+      // "consumed" by the delegate iterator. If context.method was
+      // "return", allow the original .return call to continue in the
+      // outer generator.
+      if (context.method !== "return") {
+        context.method = "next";
+        context.arg = undefined;
+      }
+
+    } else {
+      // Re-yield the result returned by the delegate method.
+      return info;
+    }
+
+    // The delegate iterator is finished, so forget it and continue with
+    // the outer generator.
+    context.delegate = null;
+    return ContinueSentinel;
+  }
+
+  // Define Generator.prototype.{next,throw,return} in terms of the
+  // unified ._invoke helper method.
+  defineIteratorMethods(Gp);
+
+  define(Gp, toStringTagSymbol, "Generator");
+
+  // A Generator should always return itself as the iterator object when the
+  // @@iterator function is called on it. Some browsers' implementations of the
+  // iterator prototype chain incorrectly implement this, causing the Generator
+  // object to not be returned from this call. This ensures that doesn't happen.
+  // See https://github.com/facebook/regenerator/issues/274 for more details.
+  define(Gp, iteratorSymbol, function() {
+    return this;
+  });
+
+  define(Gp, "toString", function() {
+    return "[object Generator]";
+  });
+
+  function pushTryEntry(locs) {
+    var entry = { tryLoc: locs[0] };
+
+    if (1 in locs) {
+      entry.catchLoc = locs[1];
+    }
+
+    if (2 in locs) {
+      entry.finallyLoc = locs[2];
+      entry.afterLoc = locs[3];
+    }
+
+    this.tryEntries.push(entry);
+  }
+
+  function resetTryEntry(entry) {
+    var record = entry.completion || {};
+    record.type = "normal";
+    delete record.arg;
+    entry.completion = record;
+  }
+
+  function Context(tryLocsList) {
+    // The root entry object (effectively a try statement without a catch
+    // or a finally block) gives us a place to store values thrown from
+    // locations where there is no enclosing try statement.
+    this.tryEntries = [{ tryLoc: "root" }];
+    tryLocsList.forEach(pushTryEntry, this);
+    this.reset(true);
+  }
+
+  exports.keys = function(val) {
+    var object = Object(val);
+    var keys = [];
+    for (var key in object) {
+      keys.push(key);
+    }
+    keys.reverse();
+
+    // Rather than returning an object with a next method, we keep
+    // things simple and return the next function itself.
+    return function next() {
+      while (keys.length) {
+        var key = keys.pop();
+        if (key in object) {
+          next.value = key;
+          next.done = false;
+          return next;
+        }
+      }
+
+      // To avoid creating an additional object, we just hang the .value
+      // and .done properties off the next function object itself. This
+      // also ensures that the minifier will not anonymize the function.
+      next.done = true;
+      return next;
+    };
+  };
+
+  function values(iterable) {
+    if (iterable || iterable === "") {
+      var iteratorMethod = iterable[iteratorSymbol];
+      if (iteratorMethod) {
+        return iteratorMethod.call(iterable);
+      }
+
+      if (typeof iterable.next === "function") {
+        return iterable;
+      }
+
+      if (!isNaN(iterable.length)) {
+        var i = -1, next = function next() {
+          while (++i < iterable.length) {
+            if (hasOwn.call(iterable, i)) {
+              next.value = iterable[i];
+              next.done = false;
+              return next;
+            }
+          }
+
+          next.value = undefined;
+          next.done = true;
+
+          return next;
+        };
+
+        return next.next = next;
+      }
+    }
+
+    throw new TypeError(typeof iterable + " is not iterable");
+  }
+  exports.values = values;
+
+  function doneResult() {
+    return { value: undefined, done: true };
+  }
+
+  Context.prototype = {
+    constructor: Context,
+
+    reset: function(skipTempReset) {
+      this.prev = 0;
+      this.next = 0;
+      // Resetting context._sent for legacy support of Babel's
+      // function.sent implementation.
+      this.sent = this._sent = undefined;
+      this.done = false;
+      this.delegate = null;
+
+      this.method = "next";
+      this.arg = undefined;
+
+      this.tryEntries.forEach(resetTryEntry);
+
+      if (!skipTempReset) {
+        for (var name in this) {
+          // Not sure about the optimal order of these conditions:
+          if (name.charAt(0) === "t" &&
+              hasOwn.call(this, name) &&
+              !isNaN(+name.slice(1))) {
+            this[name] = undefined;
+          }
+        }
+      }
+    },
+
+    stop: function() {
+      this.done = true;
+
+      var rootEntry = this.tryEntries[0];
+      var rootRecord = rootEntry.completion;
+      if (rootRecord.type === "throw") {
+        throw rootRecord.arg;
+      }
+
+      return this.rval;
+    },
+
+    dispatchException: function(exception) {
+      if (this.done) {
+        throw exception;
+      }
+
+      var context = this;
+      function handle(loc, caught) {
+        record.type = "throw";
+        record.arg = exception;
+        context.next = loc;
+
+        if (caught) {
+          // If the dispatched exception was caught by a catch block,
+          // then let that catch block handle the exception normally.
+          context.method = "next";
+          context.arg = undefined;
+        }
+
+        return !! caught;
+      }
+
+      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+        var entry = this.tryEntries[i];
+        var record = entry.completion;
+
+        if (entry.tryLoc === "root") {
+          // Exception thrown outside of any try block that could handle
+          // it, so set the completion value of the entire function to
+          // throw the exception.
+          return handle("end");
+        }
+
+        if (entry.tryLoc <= this.prev) {
+          var hasCatch = hasOwn.call(entry, "catchLoc");
+          var hasFinally = hasOwn.call(entry, "finallyLoc");
+
+          if (hasCatch && hasFinally) {
+            if (this.prev < entry.catchLoc) {
+              return handle(entry.catchLoc, true);
+            } else if (this.prev < entry.finallyLoc) {
+              return handle(entry.finallyLoc);
+            }
+
+          } else if (hasCatch) {
+            if (this.prev < entry.catchLoc) {
+              return handle(entry.catchLoc, true);
+            }
+
+          } else if (hasFinally) {
+            if (this.prev < entry.finallyLoc) {
+              return handle(entry.finallyLoc);
+            }
+
+          } else {
+            throw new Error("try statement without catch or finally");
+          }
+        }
+      }
+    },
+
+    abrupt: function(type, arg) {
+      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+        var entry = this.tryEntries[i];
+        if (entry.tryLoc <= this.prev &&
+            hasOwn.call(entry, "finallyLoc") &&
+            this.prev < entry.finallyLoc) {
+          var finallyEntry = entry;
+          break;
+        }
+      }
+
+      if (finallyEntry &&
+          (type === "break" ||
+           type === "continue") &&
+          finallyEntry.tryLoc <= arg &&
+          arg <= finallyEntry.finallyLoc) {
+        // Ignore the finally entry if control is not jumping to a
+        // location outside the try/catch block.
+        finallyEntry = null;
+      }
+
+      var record = finallyEntry ? finallyEntry.completion : {};
+      record.type = type;
+      record.arg = arg;
+
+      if (finallyEntry) {
+        this.method = "next";
+        this.next = finallyEntry.finallyLoc;
+        return ContinueSentinel;
+      }
+
+      return this.complete(record);
+    },
+
+    complete: function(record, afterLoc) {
+      if (record.type === "throw") {
+        throw record.arg;
+      }
+
+      if (record.type === "break" ||
+          record.type === "continue") {
+        this.next = record.arg;
+      } else if (record.type === "return") {
+        this.rval = this.arg = record.arg;
+        this.method = "return";
+        this.next = "end";
+      } else if (record.type === "normal" && afterLoc) {
+        this.next = afterLoc;
+      }
+
+      return ContinueSentinel;
+    },
+
+    finish: function(finallyLoc) {
+      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+        var entry = this.tryEntries[i];
+        if (entry.finallyLoc === finallyLoc) {
+          this.complete(entry.completion, entry.afterLoc);
+          resetTryEntry(entry);
+          return ContinueSentinel;
+        }
+      }
+    },
+
+    "catch": function(tryLoc) {
+      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+        var entry = this.tryEntries[i];
+        if (entry.tryLoc === tryLoc) {
+          var record = entry.completion;
+          if (record.type === "throw") {
+            var thrown = record.arg;
+            resetTryEntry(entry);
+          }
+          return thrown;
+        }
+      }
+
+      // The context.catch method must only be called with a location
+      // argument that corresponds to a known catch block.
+      throw new Error("illegal catch attempt");
+    },
+
+    delegateYield: function(iterable, resultName, nextLoc) {
+      this.delegate = {
+        iterator: values(iterable),
+        resultName: resultName,
+        nextLoc: nextLoc
+      };
+
+      if (this.method === "next") {
+        // Deliberately forget the last sent value so that we don't
+        // accidentally pass it on to the delegate.
+        this.arg = undefined;
+      }
+
+      return ContinueSentinel;
+    }
+  };
+
+  // Regardless of whether this script is executing as a CommonJS module
+  // or not, return the runtime object so that we can declare the variable
+  // regeneratorRuntime in the outer scope, which allows this module to be
+  // injected easily by `bin/regenerator --include-runtime script.js`.
+  return exports;
+
+}(
+  // If this script is executing as a CommonJS module, use module.exports
+  // as the regeneratorRuntime namespace. Otherwise create a new empty
+  // object. Either way, the resulting object will be used to initialize
+  // the regeneratorRuntime variable at the top of this file.
+  typeof module === "object" ? module.exports : {}
+));
+
+try {
+  regeneratorRuntime = runtime;
+} catch (accidentalStrictMode) {
+  // This module should not be running in strict mode, so the above
+  // assignment should always work unless something is misconfigured. Just
+  // in case runtime.js accidentally runs in strict mode, in modern engines
+  // we can explicitly access globalThis. In older engines we can escape
+  // strict mode using a global Function call. This could conceivably fail
+  // if a Content Security Policy forbids using Function, but in that case
+  // the proper solution is to fix the accidental strict mode problem. If
+  // you've misconfigured your bundler to force strict mode and applied a
+  // CSP to forbid Function, and you're not willing to fix either of those
+  // problems, please detail your unique predicament in a GitHub issue.
+  if (typeof globalThis === "object") {
+    globalThis.regeneratorRuntime = runtime;
+  } else {
+    Function("r", "regeneratorRuntime = r")(runtime);
+  }
+}

wp-includes/js/dist/vendor/wp-polyfill-dom-rect.js

@@ -0,0 +1,101 @@
+
+// DOMRect
+(function (global) {
+	function number(v) {
+		return v === undefined ? 0 : Number(v);
+	}
+
+	function different(u, v) {
+		return u !== v && !(isNaN(u) && isNaN(v));
+	}
+
+	function DOMRect(xArg, yArg, wArg, hArg) {
+		var x, y, width, height, left, right, top, bottom;
+
+		x = number(xArg);
+		y = number(yArg);
+		width = number(wArg);
+		height = number(hArg);
+
+		Object.defineProperties(this, {
+			x: {
+				get: function () { return x; },
+				set: function (newX) {
+					if (different(x, newX)) {
+						x = newX;
+						left = right = undefined;
+					}
+				},
+				enumerable: true
+			},
+			y: {
+				get: function () { return y; },
+				set: function (newY) {
+					if (different(y, newY)) {
+						y = newY;
+						top = bottom = undefined;
+					}
+				},
+				enumerable: true
+			},
+			width: {
+				get: function () { return width; },
+				set: function (newWidth) {
+					if (different(width, newWidth)) {
+						width = newWidth;
+						left = right = undefined;
+					}
+				},
+				enumerable: true
+			},
+			height: {
+				get: function () { return height; },
+				set: function (newHeight) {
+					if (different(height, newHeight)) {
+						height = newHeight;
+						top = bottom = undefined;
+					}
+				},
+				enumerable: true
+			},
+			left: {
+				get: function () {
+					if (left === undefined) {
+						left = x + Math.min(0, width);
+					}
+					return left;
+				},
+				enumerable: true
+			},
+			right: {
+				get: function () {
+					if (right === undefined) {
+						right = x + Math.max(0, width);
+					}
+					return right;
+				},
+				enumerable: true
+			},
+			top: {
+				get: function () {
+					if (top === undefined) {
+						top = y + Math.min(0, height);
+					}
+					return top;
+				},
+				enumerable: true
+			},
+			bottom: {
+				get: function () {
+					if (bottom === undefined) {
+						bottom = y + Math.max(0, height);
+					}
+					return bottom;
+				},
+				enumerable: true
+			}
+		});
+	}
+
+	global.DOMRect = DOMRect;
+}(self));

wp-includes/js/dist/vendor/wp-polyfill-dom-rect.min.js

@@ -0,0 +1 @@
+!function(){function e(e){return void 0===e?0:Number(e)}function n(e,n){return!(e===n||isNaN(e)&&isNaN(n))}self.DOMRect=function(t,i,u,r){var o,f,c,a,m=e(t),b=e(i),d=e(u),g=e(r);Object.defineProperties(this,{x:{get:function(){return m},set:function(e){n(m,e)&&(m=e,o=f=void 0)},enumerable:!0},y:{get:function(){return b},set:function(e){n(b,e)&&(b=e,c=a=void 0)},enumerable:!0},width:{get:function(){return d},set:function(e){n(d,e)&&(d=e,o=f=void 0)},enumerable:!0},height:{get:function(){return g},set:function(e){n(g,e)&&(g=e,c=a=void 0)},enumerable:!0},left:{get:function(){return o=void 0===o?m+Math.min(0,d):o},enumerable:!0},right:{get:function(){return f=void 0===f?m+Math.max(0,d):f},enumerable:!0},top:{get:function(){return c=void 0===c?b+Math.min(0,g):c},enumerable:!0},bottom:{get:function(){return a=void 0===a?b+Math.max(0,g):a},enumerable:!0}})}}();

wp-includes/js/dist/vendor/wp-polyfill-element-closest.js

@@ -0,0 +1 @@
+!function(e){var t=e.Element.prototype;"function"!=typeof t.matches&&(t.matches=t.msMatchesSelector||t.mozMatchesSelector||t.webkitMatchesSelector||function(e){for(var t=(this.document||this.ownerDocument).querySelectorAll(e),o=0;t[o]&&t[o]!==this;)++o;return Boolean(t[o])}),"function"!=typeof t.closest&&(t.closest=function(e){for(var t=this;t&&1===t.nodeType;){if(t.matches(e))return t;t=t.parentNode}return null})}(window);

wp-includes/js/dist/vendor/wp-polyfill-element-closest.min.js

@@ -0,0 +1 @@
+!function(e){var t=window.Element.prototype;"function"!=typeof t.matches&&(t.matches=t.msMatchesSelector||t.mozMatchesSelector||t.webkitMatchesSelector||function(e){for(var t=(this.document||this.ownerDocument).querySelectorAll(e),o=0;t[o]&&t[o]!==this;)++o;return Boolean(t[o])}),"function"!=typeof t.closest&&(t.closest=function(e){for(var t=this;t&&1===t.nodeType;){if(t.matches(e))return t;t=t.parentNode}return null})}();

wp-includes/js/dist/vendor/wp-polyfill-fetch.js

@@ -0,0 +1,650 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (factory((global.WHATWGFetch = {})));
+}(this, (function (exports) { 'use strict';
+
+  /* eslint-disable no-prototype-builtins */
+  var g =
+    (typeof globalThis !== 'undefined' && globalThis) ||
+    (typeof self !== 'undefined' && self) ||
+    // eslint-disable-next-line no-undef
+    (typeof global !== 'undefined' && global) ||
+    {};
+
+  var support = {
+    searchParams: 'URLSearchParams' in g,
+    iterable: 'Symbol' in g && 'iterator' in Symbol,
+    blob:
+      'FileReader' in g &&
+      'Blob' in g &&
+      (function() {
+        try {
+          new Blob();
+          return true
+        } catch (e) {
+          return false
+        }
+      })(),
+    formData: 'FormData' in g,
+    arrayBuffer: 'ArrayBuffer' in g
+  };
+
+  function isDataView(obj) {
+    return obj && DataView.prototype.isPrototypeOf(obj)
+  }
+
+  if (support.arrayBuffer) {
+    var viewClasses = [
+      '[object Int8Array]',
+      '[object Uint8Array]',
+      '[object Uint8ClampedArray]',
+      '[object Int16Array]',
+      '[object Uint16Array]',
+      '[object Int32Array]',
+      '[object Uint32Array]',
+      '[object Float32Array]',
+      '[object Float64Array]'
+    ];
+
+    var isArrayBufferView =
+      ArrayBuffer.isView ||
+      function(obj) {
+        return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
+      };
+  }
+
+  function normalizeName(name) {
+    if (typeof name !== 'string') {
+      name = String(name);
+    }
+    if (/[^a-z0-9\-#$%&'*+.^_`|~!]/i.test(name) || name === '') {
+      throw new TypeError('Invalid character in header field name: "' + name + '"')
+    }
+    return name.toLowerCase()
+  }
+
+  function normalizeValue(value) {
+    if (typeof value !== 'string') {
+      value = String(value);
+    }
+    return value
+  }
+
+  // Build a destructive iterator for the value list
+  function iteratorFor(items) {
+    var iterator = {
+      next: function() {
+        var value = items.shift();
+        return {done: value === undefined, value: value}
+      }
+    };
+
+    if (support.iterable) {
+      iterator[Symbol.iterator] = function() {
+        return iterator
+      };
+    }
+
+    return iterator
+  }
+
+  function Headers(headers) {
+    this.map = {};
+
+    if (headers instanceof Headers) {
+      headers.forEach(function(value, name) {
+        this.append(name, value);
+      }, this);
+    } else if (Array.isArray(headers)) {
+      headers.forEach(function(header) {
+        if (header.length != 2) {
+          throw new TypeError('Headers constructor: expected name/value pair to be length 2, found' + header.length)
+        }
+        this.append(header[0], header[1]);
+      }, this);
+    } else if (headers) {
+      Object.getOwnPropertyNames(headers).forEach(function(name) {
+        this.append(name, headers[name]);
+      }, this);
+    }
+  }
+
+  Headers.prototype.append = function(name, value) {
+    name = normalizeName(name);
+    value = normalizeValue(value);
+    var oldValue = this.map[name];
+    this.map[name] = oldValue ? oldValue + ', ' + value : value;
+  };
+
+  Headers.prototype['delete'] = function(name) {
+    delete this.map[normalizeName(name)];
+  };
+
+  Headers.prototype.get = function(name) {
+    name = normalizeName(name);
+    return this.has(name) ? this.map[name] : null
+  };
+
+  Headers.prototype.has = function(name) {
+    return this.map.hasOwnProperty(normalizeName(name))
+  };
+
+  Headers.prototype.set = function(name, value) {
+    this.map[normalizeName(name)] = normalizeValue(value);
+  };
+
+  Headers.prototype.forEach = function(callback, thisArg) {
+    for (var name in this.map) {
+      if (this.map.hasOwnProperty(name)) {
+        callback.call(thisArg, this.map[name], name, this);
+      }
+    }
+  };
+
+  Headers.prototype.keys = function() {
+    var items = [];
+    this.forEach(function(value, name) {
+      items.push(name);
+    });
+    return iteratorFor(items)
+  };
+
+  Headers.prototype.values = function() {
+    var items = [];
+    this.forEach(function(value) {
+      items.push(value);
+    });
+    return iteratorFor(items)
+  };
+
+  Headers.prototype.entries = function() {
+    var items = [];
+    this.forEach(function(value, name) {
+      items.push([name, value]);
+    });
+    return iteratorFor(items)
+  };
+
+  if (support.iterable) {
+    Headers.prototype[Symbol.iterator] = Headers.prototype.entries;
+  }
+
+  function consumed(body) {
+    if (body._noBody) return
+    if (body.bodyUsed) {
+      return Promise.reject(new TypeError('Already read'))
+    }
+    body.bodyUsed = true;
+  }
+
+  function fileReaderReady(reader) {
+    return new Promise(function(resolve, reject) {
+      reader.onload = function() {
+        resolve(reader.result);
+      };
+      reader.onerror = function() {
+        reject(reader.error);
+      };
+    })
+  }
+
+  function readBlobAsArrayBuffer(blob) {
+    var reader = new FileReader();
+    var promise = fileReaderReady(reader);
+    reader.readAsArrayBuffer(blob);
+    return promise
+  }
+
+  function readBlobAsText(blob) {
+    var reader = new FileReader();
+    var promise = fileReaderReady(reader);
+    var match = /charset=([A-Za-z0-9_-]+)/.exec(blob.type);
+    var encoding = match ? match[1] : 'utf-8';
+    reader.readAsText(blob, encoding);
+    return promise
+  }
+
+  function readArrayBufferAsText(buf) {
+    var view = new Uint8Array(buf);
+    var chars = new Array(view.length);
+
+    for (var i = 0; i < view.length; i++) {
+      chars[i] = String.fromCharCode(view[i]);
+    }
+    return chars.join('')
+  }
+
+  function bufferClone(buf) {
+    if (buf.slice) {
+      return buf.slice(0)
+    } else {
+      var view = new Uint8Array(buf.byteLength);
+      view.set(new Uint8Array(buf));
+      return view.buffer
+    }
+  }
+
+  function Body() {
+    this.bodyUsed = false;
+
+    this._initBody = function(body) {
+      /*
+        fetch-mock wraps the Response object in an ES6 Proxy to
+        provide useful test harness features such as flush. However, on
+        ES5 browsers without fetch or Proxy support pollyfills must be used;
+        the proxy-pollyfill is unable to proxy an attribute unless it exists
+        on the object before the Proxy is created. This change ensures
+        Response.bodyUsed exists on the instance, while maintaining the
+        semantic of setting Request.bodyUsed in the constructor before
+        _initBody is called.
+      */
+      // eslint-disable-next-line no-self-assign
+      this.bodyUsed = this.bodyUsed;
+      this._bodyInit = body;
+      if (!body) {
+        this._noBody = true;
+        this._bodyText = '';
+      } else if (typeof body === 'string') {
+        this._bodyText = body;
+      } else if (support.blob && Blob.prototype.isPrototypeOf(body)) {
+        this._bodyBlob = body;
+      } else if (support.formData && FormData.prototype.isPrototypeOf(body)) {
+        this._bodyFormData = body;
+      } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
+        this._bodyText = body.toString();
+      } else if (support.arrayBuffer && support.blob && isDataView(body)) {
+        this._bodyArrayBuffer = bufferClone(body.buffer);
+        // IE 10-11 can't handle a DataView body.
+        this._bodyInit = new Blob([this._bodyArrayBuffer]);
+      } else if (support.arrayBuffer && (ArrayBuffer.prototype.isPrototypeOf(body) || isArrayBufferView(body))) {
+        this._bodyArrayBuffer = bufferClone(body);
+      } else {
+        this._bodyText = body = Object.prototype.toString.call(body);
+      }
+
+      if (!this.headers.get('content-type')) {
+        if (typeof body === 'string') {
+          this.headers.set('content-type', 'text/plain;charset=UTF-8');
+        } else if (this._bodyBlob && this._bodyBlob.type) {
+          this.headers.set('content-type', this._bodyBlob.type);
+        } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
+          this.headers.set('content-type', 'application/x-www-form-urlencoded;charset=UTF-8');
+        }
+      }
+    };
+
+    if (support.blob) {
+      this.blob = function() {
+        var rejected = consumed(this);
+        if (rejected) {
+          return rejected
+        }
+
+        if (this._bodyBlob) {
+          return Promise.resolve(this._bodyBlob)
+        } else if (this._bodyArrayBuffer) {
+          return Promise.resolve(new Blob([this._bodyArrayBuffer]))
+        } else if (this._bodyFormData) {
+          throw new Error('could not read FormData body as blob')
+        } else {
+          return Promise.resolve(new Blob([this._bodyText]))
+        }
+      };
+    }
+
+    this.arrayBuffer = function() {
+      if (this._bodyArrayBuffer) {
+        var isConsumed = consumed(this);
+        if (isConsumed) {
+          return isConsumed
+        } else if (ArrayBuffer.isView(this._bodyArrayBuffer)) {
+          return Promise.resolve(
+            this._bodyArrayBuffer.buffer.slice(
+              this._bodyArrayBuffer.byteOffset,
+              this._bodyArrayBuffer.byteOffset + this._bodyArrayBuffer.byteLength
+            )
+          )
+        } else {
+          return Promise.resolve(this._bodyArrayBuffer)
+        }
+      } else if (support.blob) {
+        return this.blob().then(readBlobAsArrayBuffer)
+      } else {
+        throw new Error('could not read as ArrayBuffer')
+      }
+    };
+
+    this.text = function() {
+      var rejected = consumed(this);
+      if (rejected) {
+        return rejected
+      }
+
+      if (this._bodyBlob) {
+        return readBlobAsText(this._bodyBlob)
+      } else if (this._bodyArrayBuffer) {
+        return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer))
+      } else if (this._bodyFormData) {
+        throw new Error('could not read FormData body as text')
+      } else {
+        return Promise.resolve(this._bodyText)
+      }
+    };
+
+    if (support.formData) {
+      this.formData = function() {
+        return this.text().then(decode)
+      };
+    }
+
+    this.json = function() {
+      return this.text().then(JSON.parse)
+    };
+
+    return this
+  }
+
+  // HTTP methods whose capitalization should be normalized
+  var methods = ['CONNECT', 'DELETE', 'GET', 'HEAD', 'OPTIONS', 'PATCH', 'POST', 'PUT', 'TRACE'];
+
+  function normalizeMethod(method) {
+    var upcased = method.toUpperCase();
+    return methods.indexOf(upcased) > -1 ? upcased : method
+  }
+
+  function Request(input, options) {
+    if (!(this instanceof Request)) {
+      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
+    }
+
+    options = options || {};
+    var body = options.body;
+
+    if (input instanceof Request) {
+      if (input.bodyUsed) {
+        throw new TypeError('Already read')
+      }
+      this.url = input.url;
+      this.credentials = input.credentials;
+      if (!options.headers) {
+        this.headers = new Headers(input.headers);
+      }
+      this.method = input.method;
+      this.mode = input.mode;
+      this.signal = input.signal;
+      if (!body && input._bodyInit != null) {
+        body = input._bodyInit;
+        input.bodyUsed = true;
+      }
+    } else {
+      this.url = String(input);
+    }
+
+    this.credentials = options.credentials || this.credentials || 'same-origin';
+    if (options.headers || !this.headers) {
+      this.headers = new Headers(options.headers);
+    }
+    this.method = normalizeMethod(options.method || this.method || 'GET');
+    this.mode = options.mode || this.mode || null;
+    this.signal = options.signal || this.signal || (function () {
+      if ('AbortController' in g) {
+        var ctrl = new AbortController();
+        return ctrl.signal;
+      }
+    }());
+    this.referrer = null;
+
+    if ((this.method === 'GET' || this.method === 'HEAD') && body) {
+      throw new TypeError('Body not allowed for GET or HEAD requests')
+    }
+    this._initBody(body);
+
+    if (this.method === 'GET' || this.method === 'HEAD') {
+      if (options.cache === 'no-store' || options.cache === 'no-cache') {
+        // Search for a '_' parameter in the query string
+        var reParamSearch = /([?&])_=[^&]*/;
+        if (reParamSearch.test(this.url)) {
+          // If it already exists then set the value with the current time
+          this.url = this.url.replace(reParamSearch, '$1_=' + new Date().getTime());
+        } else {
+          // Otherwise add a new '_' parameter to the end with the current time
+          var reQueryString = /\?/;
+          this.url += (reQueryString.test(this.url) ? '&' : '?') + '_=' + new Date().getTime();
+        }
+      }
+    }
+  }
+
+  Request.prototype.clone = function() {
+    return new Request(this, {body: this._bodyInit})
+  };
+
+  function decode(body) {
+    var form = new FormData();
+    body
+      .trim()
+      .split('&')
+      .forEach(function(bytes) {
+        if (bytes) {
+          var split = bytes.split('=');
+          var name = split.shift().replace(/\+/g, ' ');
+          var value = split.join('=').replace(/\+/g, ' ');
+          form.append(decodeURIComponent(name), decodeURIComponent(value));
+        }
+      });
+    return form
+  }
+
+  function parseHeaders(rawHeaders) {
+    var headers = new Headers();
+    // Replace instances of \r\n and \n followed by at least one space or horizontal tab with a space
+    // https://tools.ietf.org/html/rfc7230#section-3.2
+    var preProcessedHeaders = rawHeaders.replace(/\r?\n[\t ]+/g, ' ');
+    // Avoiding split via regex to work around a common IE11 bug with the core-js 3.6.0 regex polyfill
+    // https://github.com/github/fetch/issues/748
+    // https://github.com/zloirock/core-js/issues/751
+    preProcessedHeaders
+      .split('\r')
+      .map(function(header) {
+        return header.indexOf('\n') === 0 ? header.substr(1, header.length) : header
+      })
+      .forEach(function(line) {
+        var parts = line.split(':');
+        var key = parts.shift().trim();
+        if (key) {
+          var value = parts.join(':').trim();
+          try {
+            headers.append(key, value);
+          } catch (error) {
+            console.warn('Response ' + error.message);
+          }
+        }
+      });
+    return headers
+  }
+
+  Body.call(Request.prototype);
+
+  function Response(bodyInit, options) {
+    if (!(this instanceof Response)) {
+      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
+    }
+    if (!options) {
+      options = {};
+    }
+
+    this.type = 'default';
+    this.status = options.status === undefined ? 200 : options.status;
+    if (this.status < 200 || this.status > 599) {
+      throw new RangeError("Failed to construct 'Response': The status provided (0) is outside the range [200, 599].")
+    }
+    this.ok = this.status >= 200 && this.status < 300;
+    this.statusText = options.statusText === undefined ? '' : '' + options.statusText;
+    this.headers = new Headers(options.headers);
+    this.url = options.url || '';
+    this._initBody(bodyInit);
+  }
+
+  Body.call(Response.prototype);
+
+  Response.prototype.clone = function() {
+    return new Response(this._bodyInit, {
+      status: this.status,
+      statusText: this.statusText,
+      headers: new Headers(this.headers),
+      url: this.url
+    })
+  };
+
+  Response.error = function() {
+    var response = new Response(null, {status: 200, statusText: ''});
+    response.status = 0;
+    response.type = 'error';
+    return response
+  };
+
+  var redirectStatuses = [301, 302, 303, 307, 308];
+
+  Response.redirect = function(url, status) {
+    if (redirectStatuses.indexOf(status) === -1) {
+      throw new RangeError('Invalid status code')
+    }
+
+    return new Response(null, {status: status, headers: {location: url}})
+  };
+
+  exports.DOMException = g.DOMException;
+  try {
+    new exports.DOMException();
+  } catch (err) {
+    exports.DOMException = function(message, name) {
+      this.message = message;
+      this.name = name;
+      var error = Error(message);
+      this.stack = error.stack;
+    };
+    exports.DOMException.prototype = Object.create(Error.prototype);
+    exports.DOMException.prototype.constructor = exports.DOMException;
+  }
+
+  function fetch(input, init) {
+    return new Promise(function(resolve, reject) {
+      var request = new Request(input, init);
+
+      if (request.signal && request.signal.aborted) {
+        return reject(new exports.DOMException('Aborted', 'AbortError'))
+      }
+
+      var xhr = new XMLHttpRequest();
+
+      function abortXhr() {
+        xhr.abort();
+      }
+
+      xhr.onload = function() {
+        var options = {
+          status: xhr.status,
+          statusText: xhr.statusText,
+          headers: parseHeaders(xhr.getAllResponseHeaders() || '')
+        };
+        options.url = 'responseURL' in xhr ? xhr.responseURL : options.headers.get('X-Request-URL');
+        var body = 'response' in xhr ? xhr.response : xhr.responseText;
+        setTimeout(function() {
+          resolve(new Response(body, options));
+        }, 0);
+      };
+
+      xhr.onerror = function() {
+        setTimeout(function() {
+          reject(new TypeError('Network request failed'));
+        }, 0);
+      };
+
+      xhr.ontimeout = function() {
+        setTimeout(function() {
+          reject(new TypeError('Network request failed'));
+        }, 0);
+      };
+
+      xhr.onabort = function() {
+        setTimeout(function() {
+          reject(new exports.DOMException('Aborted', 'AbortError'));
+        }, 0);
+      };
+
+      function fixUrl(url) {
+        try {
+          return url === '' && g.location.href ? g.location.href : url
+        } catch (e) {
+          return url
+        }
+      }
+
+      xhr.open(request.method, fixUrl(request.url), true);
+
+      if (request.credentials === 'include') {
+        xhr.withCredentials = true;
+      } else if (request.credentials === 'omit') {
+        xhr.withCredentials = false;
+      }
+
+      if ('responseType' in xhr) {
+        if (support.blob) {
+          xhr.responseType = 'blob';
+        } else if (
+          support.arrayBuffer
+        ) {
+          xhr.responseType = 'arraybuffer';
+        }
+      }
+
+      if (init && typeof init.headers === 'object' && !(init.headers instanceof Headers || (g.Headers && init.headers instanceof g.Headers))) {
+        var names = [];
+        Object.getOwnPropertyNames(init.headers).forEach(function(name) {
+          names.push(normalizeName(name));
+          xhr.setRequestHeader(name, normalizeValue(init.headers[name]));
+        });
+        request.headers.forEach(function(value, name) {
+          if (names.indexOf(name) === -1) {
+            xhr.setRequestHeader(name, value);
+          }
+        });
+      } else {
+        request.headers.forEach(function(value, name) {
+          xhr.setRequestHeader(name, value);
+        });
+      }
+
+      if (request.signal) {
+        request.signal.addEventListener('abort', abortXhr);
+
+        xhr.onreadystatechange = function() {
+          // DONE (success or failure)
+          if (xhr.readyState === 4) {
+            request.signal.removeEventListener('abort', abortXhr);
+          }
+        };
+      }
+
+      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit);
+    })
+  }
+
+  fetch.polyfill = true;
+
+  if (!g.fetch) {
+    g.fetch = fetch;
+    g.Headers = Headers;
+    g.Request = Request;
+    g.Response = Response;
+  }
+
+  exports.Headers = Headers;
+  exports.Request = Request;
+  exports.Response = Response;
+  exports.fetch = fetch;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+})));

wp-includes/js/dist/vendor/wp-polyfill-formdata.js

@@ -0,0 +1,441 @@
+/* formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+/* global FormData self Blob File */
+/* eslint-disable no-inner-declarations */
+
+if (typeof Blob !== 'undefined' && (typeof FormData === 'undefined' || !FormData.prototype.keys)) {
+  const global = typeof globalThis === 'object'
+    ? globalThis
+    : typeof window === 'object'
+      ? window
+      : typeof self === 'object' ? self : this
+
+  // keep a reference to native implementation
+  const _FormData = global.FormData
+
+  // To be monkey patched
+  const _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
+  const _fetch = global.Request && global.fetch
+  const _sendBeacon = global.navigator && global.navigator.sendBeacon
+  // Might be a worker thread...
+  const _match = global.Element && global.Element.prototype
+
+  // Unable to patch Request/Response constructor correctly #109
+  // only way is to use ES6 class extend
+  // https://github.com/babel/babel/issues/1966
+
+  const stringTag = global.Symbol && Symbol.toStringTag
+
+  // Add missing stringTags to blob and files
+  if (stringTag) {
+    if (!Blob.prototype[stringTag]) {
+      Blob.prototype[stringTag] = 'Blob'
+    }
+
+    if ('File' in global && !File.prototype[stringTag]) {
+      File.prototype[stringTag] = 'File'
+    }
+  }
+
+  // Fix so you can construct your own File
+  try {
+    new File([], '') // eslint-disable-line
+  } catch (a) {
+    global.File = function File (b, d, c) {
+      const blob = new Blob(b, c || {})
+      const t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date()
+
+      Object.defineProperties(blob, {
+        name: {
+          value: d
+        },
+        lastModified: {
+          value: +t
+        },
+        toString: {
+          value () {
+            return '[object File]'
+          }
+        }
+      })
+
+      if (stringTag) {
+        Object.defineProperty(blob, stringTag, {
+          value: 'File'
+        })
+      }
+
+      return blob
+    }
+  }
+
+  function ensureArgs (args, expected) {
+    if (args.length < expected) {
+      throw new TypeError(`${expected} argument required, but only ${args.length} present.`)
+    }
+  }
+
+  /**
+   * @param {string} name
+   * @param {string | undefined} filename
+   * @returns {[string, File|string]}
+   */
+  function normalizeArgs (name, value, filename) {
+    if (value instanceof Blob) {
+      filename = filename !== undefined
+      ? String(filename + '')
+      : typeof value.name === 'string'
+      ? value.name
+      : 'blob'
+
+      if (value.name !== filename || Object.prototype.toString.call(value) === '[object Blob]') {
+        value = new File([value], filename)
+      }
+      return [String(name), value]
+    }
+    return [String(name), String(value)]
+  }
+
+  // normalize line feeds for textarea
+  // https://html.spec.whatwg.org/multipage/form-elements.html#textarea-line-break-normalisation-transformation
+  function normalizeLinefeeds (value) {
+    return value.replace(/\r?\n|\r/g, '\r\n')
+  }
+
+  /**
+   * @template T
+   * @param {ArrayLike<T>} arr
+   * @param {{ (elm: T): void; }} cb
+   */
+  function each (arr, cb) {
+    for (let i = 0; i < arr.length; i++) {
+      cb(arr[i])
+    }
+  }
+
+  const escape = str => str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
+
+  /**
+   * @implements {Iterable}
+   */
+  class FormDataPolyfill {
+    /**
+     * FormData class
+     *
+     * @param {HTMLFormElement=} form
+     */
+    constructor (form) {
+      /** @type {[string, string|File][]} */
+      this._data = []
+
+      const self = this
+      form && each(form.elements, (/** @type {HTMLInputElement} */ elm) => {
+        if (
+          !elm.name ||
+          elm.disabled ||
+          elm.type === 'submit' ||
+          elm.type === 'button' ||
+          elm.matches('form fieldset[disabled] *')
+        ) return
+
+        if (elm.type === 'file') {
+          const files = elm.files && elm.files.length
+            ? elm.files
+            : [new File([], '', { type: 'application/octet-stream' })] // #78
+
+          each(files, file => {
+            self.append(elm.name, file)
+          })
+        } else if (elm.type === 'select-multiple' || elm.type === 'select-one') {
+          each(elm.options, opt => {
+            !opt.disabled && opt.selected && self.append(elm.name, opt.value)
+          })
+        } else if (elm.type === 'checkbox' || elm.type === 'radio') {
+          if (elm.checked) self.append(elm.name, elm.value)
+        } else {
+          const value = elm.type === 'textarea' ? normalizeLinefeeds(elm.value) : elm.value
+          self.append(elm.name, value)
+        }
+      })
+    }
+
+    /**
+     * Append a field
+     *
+     * @param   {string}           name      field name
+     * @param   {string|Blob|File} value     string / blob / file
+     * @param   {string=}          filename  filename to use with blob
+     * @return  {undefined}
+     */
+    append (name, value, filename) {
+      ensureArgs(arguments, 2)
+      this._data.push(normalizeArgs(name, value, filename))
+    }
+
+    /**
+     * Delete all fields values given name
+     *
+     * @param   {string}  name  Field name
+     * @return  {undefined}
+     */
+    delete (name) {
+      ensureArgs(arguments, 1)
+      const result = []
+      name = String(name)
+
+      each(this._data, entry => {
+        entry[0] !== name && result.push(entry)
+      })
+
+      this._data = result
+    }
+
+    /**
+     * Iterate over all fields as [name, value]
+     *
+     * @return {Iterator}
+     */
+    * entries () {
+      for (var i = 0; i < this._data.length; i++) {
+        yield this._data[i]
+      }
+    }
+
+    /**
+     * Iterate over all fields
+     *
+     * @param   {Function}  callback  Executed for each item with parameters (value, name, thisArg)
+     * @param   {Object=}   thisArg   `this` context for callback function
+     */
+    forEach (callback, thisArg) {
+      ensureArgs(arguments, 1)
+      for (const [name, value] of this) {
+        callback.call(thisArg, value, name, this)
+      }
+    }
+
+    /**
+     * Return first field value given name
+     * or null if non existent
+     *
+     * @param   {string}  name      Field name
+     * @return  {string|File|null}  value Fields value
+     */
+    get (name) {
+      ensureArgs(arguments, 1)
+      const entries = this._data
+      name = String(name)
+      for (let i = 0; i < entries.length; i++) {
+        if (entries[i][0] === name) {
+          return entries[i][1]
+        }
+      }
+      return null
+    }
+
+    /**
+     * Return all fields values given name
+     *
+     * @param   {string}  name  Fields name
+     * @return  {Array}         [{String|File}]
+     */
+    getAll (name) {
+      ensureArgs(arguments, 1)
+      const result = []
+      name = String(name)
+      each(this._data, data => {
+        data[0] === name && result.push(data[1])
+      })
+
+      return result
+    }
+
+    /**
+     * Check for field name existence
+     *
+     * @param   {string}   name  Field name
+     * @return  {boolean}
+     */
+    has (name) {
+      ensureArgs(arguments, 1)
+      name = String(name)
+      for (let i = 0; i < this._data.length; i++) {
+        if (this._data[i][0] === name) {
+          return true
+        }
+      }
+      return false
+    }
+
+    /**
+     * Iterate over all fields name
+     *
+     * @return {Iterator}
+     */
+    * keys () {
+      for (const [name] of this) {
+        yield name
+      }
+    }
+
+    /**
+     * Overwrite all values given name
+     *
+     * @param   {string}    name      Filed name
+     * @param   {string}    value     Field value
+     * @param   {string=}   filename  Filename (optional)
+     */
+    set (name, value, filename) {
+      ensureArgs(arguments, 2)
+      name = String(name)
+      /** @type {[string, string|File][]} */
+      const result = []
+      const args = normalizeArgs(name, value, filename)
+      let replace = true
+
+      // - replace the first occurrence with same name
+      // - discards the remaining with same name
+      // - while keeping the same order items where added
+      each(this._data, data => {
+        data[0] === name
+          ? replace && (replace = !result.push(args))
+          : result.push(data)
+      })
+
+      replace && result.push(args)
+
+      this._data = result
+    }
+
+    /**
+     * Iterate over all fields
+     *
+     * @return {Iterator}
+     */
+    * values () {
+      for (const [, value] of this) {
+        yield value
+      }
+    }
+
+    /**
+     * Return a native (perhaps degraded) FormData with only a `append` method
+     * Can throw if it's not supported
+     *
+     * @return {FormData}
+     */
+    ['_asNative'] () {
+      const fd = new _FormData()
+
+      for (const [name, value] of this) {
+        fd.append(name, value)
+      }
+
+      return fd
+    }
+
+    /**
+     * [_blob description]
+     *
+     * @return {Blob} [description]
+     */
+    ['_blob'] () {
+        const boundary = '----formdata-polyfill-' + Math.random(),
+          chunks = [],
+          p = `--${boundary}\r\nContent-Disposition: form-data; name="`
+        this.forEach((value, name) => typeof value == 'string'
+          ? chunks.push(p + escape(normalizeLinefeeds(name)) + `"\r\n\r\n${normalizeLinefeeds(value)}\r\n`)
+          : chunks.push(p + escape(normalizeLinefeeds(name)) + `"; filename="${escape(value.name)}"\r\nContent-Type: ${value.type||"application/octet-stream"}\r\n\r\n`, value, `\r\n`))
+        chunks.push(`--${boundary}--`)
+        return new Blob(chunks, {
+          type: "multipart/form-data; boundary=" + boundary
+        })
+    }
+
+    /**
+     * The class itself is iterable
+     * alias for formdata.entries()
+     *
+     * @return {Iterator}
+     */
+    [Symbol.iterator] () {
+      return this.entries()
+    }
+
+    /**
+     * Create the default string description.
+     *
+     * @return  {string} [object FormData]
+     */
+    toString () {
+      return '[object FormData]'
+    }
+  }
+
+  if (_match && !_match.matches) {
+    _match.matches =
+      _match.matchesSelector ||
+      _match.mozMatchesSelector ||
+      _match.msMatchesSelector ||
+      _match.oMatchesSelector ||
+      _match.webkitMatchesSelector ||
+      function (s) {
+        var matches = (this.document || this.ownerDocument).querySelectorAll(s)
+        var i = matches.length
+        while (--i >= 0 && matches.item(i) !== this) {}
+        return i > -1
+      }
+  }
+
+  if (stringTag) {
+    /**
+     * Create the default string description.
+     * It is accessed internally by the Object.prototype.toString().
+     */
+    FormDataPolyfill.prototype[stringTag] = 'FormData'
+  }
+
+  // Patch xhr's send method to call _blob transparently
+  if (_send) {
+    const setRequestHeader = global.XMLHttpRequest.prototype.setRequestHeader
+
+    global.XMLHttpRequest.prototype.setRequestHeader = function (name, value) {
+      setRequestHeader.call(this, name, value)
+      if (name.toLowerCase() === 'content-type') this._hasContentType = true
+    }
+
+    global.XMLHttpRequest.prototype.send = function (data) {
+      // need to patch send b/c old IE don't send blob's type (#44)
+      if (data instanceof FormDataPolyfill) {
+        const blob = data['_blob']()
+        if (!this._hasContentType) this.setRequestHeader('Content-Type', blob.type)
+        _send.call(this, blob)
+      } else {
+        _send.call(this, data)
+      }
+    }
+  }
+
+  // Patch fetch's function to call _blob transparently
+  if (_fetch) {
+    global.fetch = function (input, init) {
+      if (init && init.body && init.body instanceof FormDataPolyfill) {
+        init.body = init.body['_blob']()
+      }
+
+      return _fetch.call(this, input, init)
+    }
+  }
+
+  // Patch navigator.sendBeacon to use native FormData
+  if (_sendBeacon) {
+    global.navigator.sendBeacon = function (url, data) {
+      if (data instanceof FormDataPolyfill) {
+        data = data['_asNative']()
+      }
+      return _sendBeacon.call(this, url, data)
+    }
+  }
+
+  global['FormData'] = FormDataPolyfill
+}

wp-includes/js/dist/vendor/wp-polyfill-inert.js

@@ -0,0 +1,840 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+  typeof define === 'function' && define.amd ? define('inert', factory) :
+  (factory());
+}(this, (function () { 'use strict';
+
+  var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
+
+  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+  /**
+   * This work is licensed under the W3C Software and Document License
+   * (http://www.w3.org/Consortium/Legal/2015/copyright-software-and-document).
+   */
+
+  (function () {
+    // Return early if we're not running inside of the browser.
+    if (typeof window === 'undefined') {
+      return;
+    }
+
+    // Convenience function for converting NodeLists.
+    /** @type {typeof Array.prototype.slice} */
+    var slice = Array.prototype.slice;
+
+    /**
+     * IE has a non-standard name for "matches".
+     * @type {typeof Element.prototype.matches}
+     */
+    var matches = Element.prototype.matches || Element.prototype.msMatchesSelector;
+
+    /** @type {string} */
+    var _focusableElementsString = ['a[href]', 'area[href]', 'input:not([disabled])', 'select:not([disabled])', 'textarea:not([disabled])', 'button:not([disabled])', 'details', 'summary', 'iframe', 'object', 'embed', '[contenteditable]'].join(',');
+
+    /**
+     * `InertRoot` manages a single inert subtree, i.e. a DOM subtree whose root element has an `inert`
+     * attribute.
+     *
+     * Its main functions are:
+     *
+     * - to create and maintain a set of managed `InertNode`s, including when mutations occur in the
+     *   subtree. The `makeSubtreeUnfocusable()` method handles collecting `InertNode`s via registering
+     *   each focusable node in the subtree with the singleton `InertManager` which manages all known
+     *   focusable nodes within inert subtrees. `InertManager` ensures that a single `InertNode`
+     *   instance exists for each focusable node which has at least one inert root as an ancestor.
+     *
+     * - to notify all managed `InertNode`s when this subtree stops being inert (i.e. when the `inert`
+     *   attribute is removed from the root node). This is handled in the destructor, which calls the
+     *   `deregister` method on `InertManager` for each managed inert node.
+     */
+
+    var InertRoot = function () {
+      /**
+       * @param {!HTMLElement} rootElement The HTMLElement at the root of the inert subtree.
+       * @param {!InertManager} inertManager The global singleton InertManager object.
+       */
+      function InertRoot(rootElement, inertManager) {
+        _classCallCheck(this, InertRoot);
+
+        /** @type {!InertManager} */
+        this._inertManager = inertManager;
+
+        /** @type {!HTMLElement} */
+        this._rootElement = rootElement;
+
+        /**
+         * @type {!Set<!InertNode>}
+         * All managed focusable nodes in this InertRoot's subtree.
+         */
+        this._managedNodes = new Set();
+
+        // Make the subtree hidden from assistive technology
+        if (this._rootElement.hasAttribute('aria-hidden')) {
+          /** @type {?string} */
+          this._savedAriaHidden = this._rootElement.getAttribute('aria-hidden');
+        } else {
+          this._savedAriaHidden = null;
+        }
+        this._rootElement.setAttribute('aria-hidden', 'true');
+
+        // Make all focusable elements in the subtree unfocusable and add them to _managedNodes
+        this._makeSubtreeUnfocusable(this._rootElement);
+
+        // Watch for:
+        // - any additions in the subtree: make them unfocusable too
+        // - any removals from the subtree: remove them from this inert root's managed nodes
+        // - attribute changes: if `tabindex` is added, or removed from an intrinsically focusable
+        //   element, make that node a managed node.
+        this._observer = new MutationObserver(this._onMutation.bind(this));
+        this._observer.observe(this._rootElement, { attributes: true, childList: true, subtree: true });
+      }
+
+      /**
+       * Call this whenever this object is about to become obsolete.  This unwinds all of the state
+       * stored in this object and updates the state of all of the managed nodes.
+       */
+
+
+      _createClass(InertRoot, [{
+        key: 'destructor',
+        value: function destructor() {
+          this._observer.disconnect();
+
+          if (this._rootElement) {
+            if (this._savedAriaHidden !== null) {
+              this._rootElement.setAttribute('aria-hidden', this._savedAriaHidden);
+            } else {
+              this._rootElement.removeAttribute('aria-hidden');
+            }
+          }
+
+          this._managedNodes.forEach(function (inertNode) {
+            this._unmanageNode(inertNode.node);
+          }, this);
+
+          // Note we cast the nulls to the ANY type here because:
+          // 1) We want the class properties to be declared as non-null, or else we
+          //    need even more casts throughout this code. All bets are off if an
+          //    instance has been destroyed and a method is called.
+          // 2) We don't want to cast "this", because we want type-aware optimizations
+          //    to know which properties we're setting.
+          this._observer = /** @type {?} */null;
+          this._rootElement = /** @type {?} */null;
+          this._managedNodes = /** @type {?} */null;
+          this._inertManager = /** @type {?} */null;
+        }
+
+        /**
+         * @return {!Set<!InertNode>} A copy of this InertRoot's managed nodes set.
+         */
+
+      }, {
+        key: '_makeSubtreeUnfocusable',
+
+
+        /**
+         * @param {!Node} startNode
+         */
+        value: function _makeSubtreeUnfocusable(startNode) {
+          var _this2 = this;
+
+          composedTreeWalk(startNode, function (node) {
+            return _this2._visitNode(node);
+          });
+
+          var activeElement = document.activeElement;
+
+          if (!document.body.contains(startNode)) {
+            // startNode may be in shadow DOM, so find its nearest shadowRoot to get the activeElement.
+            var node = startNode;
+            /** @type {!ShadowRoot|undefined} */
+            var root = undefined;
+            while (node) {
+              if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
+                root = /** @type {!ShadowRoot} */node;
+                break;
+              }
+              node = node.parentNode;
+            }
+            if (root) {
+              activeElement = root.activeElement;
+            }
+          }
+          if (startNode.contains(activeElement)) {
+            activeElement.blur();
+            // In IE11, if an element is already focused, and then set to tabindex=-1
+            // calling blur() will not actually move the focus.
+            // To work around this we call focus() on the body instead.
+            if (activeElement === document.activeElement) {
+              document.body.focus();
+            }
+          }
+        }
+
+        /**
+         * @param {!Node} node
+         */
+
+      }, {
+        key: '_visitNode',
+        value: function _visitNode(node) {
+          if (node.nodeType !== Node.ELEMENT_NODE) {
+            return;
+          }
+          var element = /** @type {!HTMLElement} */node;
+
+          // If a descendant inert root becomes un-inert, its descendants will still be inert because of
+          // this inert root, so all of its managed nodes need to be adopted by this InertRoot.
+          if (element !== this._rootElement && element.hasAttribute('inert')) {
+            this._adoptInertRoot(element);
+          }
+
+          if (matches.call(element, _focusableElementsString) || element.hasAttribute('tabindex')) {
+            this._manageNode(element);
+          }
+        }
+
+        /**
+         * Register the given node with this InertRoot and with InertManager.
+         * @param {!Node} node
+         */
+
+      }, {
+        key: '_manageNode',
+        value: function _manageNode(node) {
+          var inertNode = this._inertManager.register(node, this);
+          this._managedNodes.add(inertNode);
+        }
+
+        /**
+         * Unregister the given node with this InertRoot and with InertManager.
+         * @param {!Node} node
+         */
+
+      }, {
+        key: '_unmanageNode',
+        value: function _unmanageNode(node) {
+          var inertNode = this._inertManager.deregister(node, this);
+          if (inertNode) {
+            this._managedNodes['delete'](inertNode);
+          }
+        }
+
+        /**
+         * Unregister the entire subtree starting at `startNode`.
+         * @param {!Node} startNode
+         */
+
+      }, {
+        key: '_unmanageSubtree',
+        value: function _unmanageSubtree(startNode) {
+          var _this3 = this;
+
+          composedTreeWalk(startNode, function (node) {
+            return _this3._unmanageNode(node);
+          });
+        }
+
+        /**
+         * If a descendant node is found with an `inert` attribute, adopt its managed nodes.
+         * @param {!HTMLElement} node
+         */
+
+      }, {
+        key: '_adoptInertRoot',
+        value: function _adoptInertRoot(node) {
+          var inertSubroot = this._inertManager.getInertRoot(node);
+
+          // During initialisation this inert root may not have been registered yet,
+          // so register it now if need be.
+          if (!inertSubroot) {
+            this._inertManager.setInert(node, true);
+            inertSubroot = this._inertManager.getInertRoot(node);
+          }
+
+          inertSubroot.managedNodes.forEach(function (savedInertNode) {
+            this._manageNode(savedInertNode.node);
+          }, this);
+        }
+
+        /**
+         * Callback used when mutation observer detects subtree additions, removals, or attribute changes.
+         * @param {!Array<!MutationRecord>} records
+         * @param {!MutationObserver} self
+         */
+
+      }, {
+        key: '_onMutation',
+        value: function _onMutation(records, self) {
+          records.forEach(function (record) {
+            var target = /** @type {!HTMLElement} */record.target;
+            if (record.type === 'childList') {
+              // Manage added nodes
+              slice.call(record.addedNodes).forEach(function (node) {
+                this._makeSubtreeUnfocusable(node);
+              }, this);
+
+              // Un-manage removed nodes
+              slice.call(record.removedNodes).forEach(function (node) {
+                this._unmanageSubtree(node);
+              }, this);
+            } else if (record.type === 'attributes') {
+              if (record.attributeName === 'tabindex') {
+                // Re-initialise inert node if tabindex changes
+                this._manageNode(target);
+              } else if (target !== this._rootElement && record.attributeName === 'inert' && target.hasAttribute('inert')) {
+                // If a new inert root is added, adopt its managed nodes and make sure it knows about the
+                // already managed nodes from this inert subroot.
+                this._adoptInertRoot(target);
+                var inertSubroot = this._inertManager.getInertRoot(target);
+                this._managedNodes.forEach(function (managedNode) {
+                  if (target.contains(managedNode.node)) {
+                    inertSubroot._manageNode(managedNode.node);
+                  }
+                });
+              }
+            }
+          }, this);
+        }
+      }, {
+        key: 'managedNodes',
+        get: function get() {
+          return new Set(this._managedNodes);
+        }
+
+        /** @return {boolean} */
+
+      }, {
+        key: 'hasSavedAriaHidden',
+        get: function get() {
+          return this._savedAriaHidden !== null;
+        }
+
+        /** @param {?string} ariaHidden */
+
+      }, {
+        key: 'savedAriaHidden',
+        set: function set(ariaHidden) {
+          this._savedAriaHidden = ariaHidden;
+        }
+
+        /** @return {?string} */
+        ,
+        get: function get() {
+          return this._savedAriaHidden;
+        }
+      }]);
+
+      return InertRoot;
+    }();
+
+    /**
+     * `InertNode` initialises and manages a single inert node.
+     * A node is inert if it is a descendant of one or more inert root elements.
+     *
+     * On construction, `InertNode` saves the existing `tabindex` value for the node, if any, and
+     * either removes the `tabindex` attribute or sets it to `-1`, depending on whether the element
+     * is intrinsically focusable or not.
+     *
+     * `InertNode` maintains a set of `InertRoot`s which are descendants of this `InertNode`. When an
+     * `InertRoot` is destroyed, and calls `InertManager.deregister()`, the `InertManager` notifies the
+     * `InertNode` via `removeInertRoot()`, which in turn destroys the `InertNode` if no `InertRoot`s
+     * remain in the set. On destruction, `InertNode` reinstates the stored `tabindex` if one exists,
+     * or removes the `tabindex` attribute if the element is intrinsically focusable.
+     */
+
+
+    var InertNode = function () {
+      /**
+       * @param {!Node} node A focusable element to be made inert.
+       * @param {!InertRoot} inertRoot The inert root element associated with this inert node.
+       */
+      function InertNode(node, inertRoot) {
+        _classCallCheck(this, InertNode);
+
+        /** @type {!Node} */
+        this._node = node;
+
+        /** @type {boolean} */
+        this._overrodeFocusMethod = false;
+
+        /**
+         * @type {!Set<!InertRoot>} The set of descendant inert roots.
+         *    If and only if this set becomes empty, this node is no longer inert.
+         */
+        this._inertRoots = new Set([inertRoot]);
+
+        /** @type {?number} */
+        this._savedTabIndex = null;
+
+        /** @type {boolean} */
+        this._destroyed = false;
+
+        // Save any prior tabindex info and make this node untabbable
+        this.ensureUntabbable();
+      }
+
+      /**
+       * Call this whenever this object is about to become obsolete.
+       * This makes the managed node focusable again and deletes all of the previously stored state.
+       */
+
+
+      _createClass(InertNode, [{
+        key: 'destructor',
+        value: function destructor() {
+          this._throwIfDestroyed();
+
+          if (this._node && this._node.nodeType === Node.ELEMENT_NODE) {
+            var element = /** @type {!HTMLElement} */this._node;
+            if (this._savedTabIndex !== null) {
+              element.setAttribute('tabindex', this._savedTabIndex);
+            } else {
+              element.removeAttribute('tabindex');
+            }
+
+            // Use `delete` to restore native focus method.
+            if (this._overrodeFocusMethod) {
+              delete element.focus;
+            }
+          }
+
+          // See note in InertRoot.destructor for why we cast these nulls to ANY.
+          this._node = /** @type {?} */null;
+          this._inertRoots = /** @type {?} */null;
+          this._destroyed = true;
+        }
+
+        /**
+         * @type {boolean} Whether this object is obsolete because the managed node is no longer inert.
+         * If the object has been destroyed, any attempt to access it will cause an exception.
+         */
+
+      }, {
+        key: '_throwIfDestroyed',
+
+
+        /**
+         * Throw if user tries to access destroyed InertNode.
+         */
+        value: function _throwIfDestroyed() {
+          if (this.destroyed) {
+            throw new Error('Trying to access destroyed InertNode');
+          }
+        }
+
+        /** @return {boolean} */
+
+      }, {
+        key: 'ensureUntabbable',
+
+
+        /** Save the existing tabindex value and make the node untabbable and unfocusable */
+        value: function ensureUntabbable() {
+          if (this.node.nodeType !== Node.ELEMENT_NODE) {
+            return;
+          }
+          var element = /** @type {!HTMLElement} */this.node;
+          if (matches.call(element, _focusableElementsString)) {
+            if ( /** @type {!HTMLElement} */element.tabIndex === -1 && this.hasSavedTabIndex) {
+              return;
+            }
+
+            if (element.hasAttribute('tabindex')) {
+              this._savedTabIndex = /** @type {!HTMLElement} */element.tabIndex;
+            }
+            element.setAttribute('tabindex', '-1');
+            if (element.nodeType === Node.ELEMENT_NODE) {
+              element.focus = function () {};
+              this._overrodeFocusMethod = true;
+            }
+          } else if (element.hasAttribute('tabindex')) {
+            this._savedTabIndex = /** @type {!HTMLElement} */element.tabIndex;
+            element.removeAttribute('tabindex');
+          }
+        }
+
+        /**
+         * Add another inert root to this inert node's set of managing inert roots.
+         * @param {!InertRoot} inertRoot
+         */
+
+      }, {
+        key: 'addInertRoot',
+        value: function addInertRoot(inertRoot) {
+          this._throwIfDestroyed();
+          this._inertRoots.add(inertRoot);
+        }
+
+        /**
+         * Remove the given inert root from this inert node's set of managing inert roots.
+         * If the set of managing inert roots becomes empty, this node is no longer inert,
+         * so the object should be destroyed.
+         * @param {!InertRoot} inertRoot
+         */
+
+      }, {
+        key: 'removeInertRoot',
+        value: function removeInertRoot(inertRoot) {
+          this._throwIfDestroyed();
+          this._inertRoots['delete'](inertRoot);
+          if (this._inertRoots.size === 0) {
+            this.destructor();
+          }
+        }
+      }, {
+        key: 'destroyed',
+        get: function get() {
+          return (/** @type {!InertNode} */this._destroyed
+          );
+        }
+      }, {
+        key: 'hasSavedTabIndex',
+        get: function get() {
+          return this._savedTabIndex !== null;
+        }
+
+        /** @return {!Node} */
+
+      }, {
+        key: 'node',
+        get: function get() {
+          this._throwIfDestroyed();
+          return this._node;
+        }
+
+        /** @param {?number} tabIndex */
+
+      }, {
+        key: 'savedTabIndex',
+        set: function set(tabIndex) {
+          this._throwIfDestroyed();
+          this._savedTabIndex = tabIndex;
+        }
+
+        /** @return {?number} */
+        ,
+        get: function get() {
+          this._throwIfDestroyed();
+          return this._savedTabIndex;
+        }
+      }]);
+
+      return InertNode;
+    }();
+
+    /**
+     * InertManager is a per-document singleton object which manages all inert roots and nodes.
+     *
+     * When an element becomes an inert root by having an `inert` attribute set and/or its `inert`
+     * property set to `true`, the `setInert` method creates an `InertRoot` object for the element.
+     * The `InertRoot` in turn registers itself as managing all of the element's focusable descendant
+     * nodes via the `register()` method. The `InertManager` ensures that a single `InertNode` instance
+     * is created for each such node, via the `_managedNodes` map.
+     */
+
+
+    var InertManager = function () {
+      /**
+       * @param {!Document} document
+       */
+      function InertManager(document) {
+        _classCallCheck(this, InertManager);
+
+        if (!document) {
+          throw new Error('Missing required argument; InertManager needs to wrap a document.');
+        }
+
+        /** @type {!Document} */
+        this._document = document;
+
+        /**
+         * All managed nodes known to this InertManager. In a map to allow looking up by Node.
+         * @type {!Map<!Node, !InertNode>}
+         */
+        this._managedNodes = new Map();
+
+        /**
+         * All inert roots known to this InertManager. In a map to allow looking up by Node.
+         * @type {!Map<!Node, !InertRoot>}
+         */
+        this._inertRoots = new Map();
+
+        /**
+         * Observer for mutations on `document.body`.
+         * @type {!MutationObserver}
+         */
+        this._observer = new MutationObserver(this._watchForInert.bind(this));
+
+        // Add inert style.
+        addInertStyle(document.head || document.body || document.documentElement);
+
+        // Wait for document to be loaded.
+        if (document.readyState === 'loading') {
+          document.addEventListener('DOMContentLoaded', this._onDocumentLoaded.bind(this));
+        } else {
+          this._onDocumentLoaded();
+        }
+      }
+
+      /**
+       * Set whether the given element should be an inert root or not.
+       * @param {!HTMLElement} root
+       * @param {boolean} inert
+       */
+
+
+      _createClass(InertManager, [{
+        key: 'setInert',
+        value: function setInert(root, inert) {
+          if (inert) {
+            if (this._inertRoots.has(root)) {
+              // element is already inert
+              return;
+            }
+
+            var inertRoot = new InertRoot(root, this);
+            root.setAttribute('inert', '');
+            this._inertRoots.set(root, inertRoot);
+            // If not contained in the document, it must be in a shadowRoot.
+            // Ensure inert styles are added there.
+            if (!this._document.body.contains(root)) {
+              var parent = root.parentNode;
+              while (parent) {
+                if (parent.nodeType === 11) {
+                  addInertStyle(parent);
+                }
+                parent = parent.parentNode;
+              }
+            }
+          } else {
+            if (!this._inertRoots.has(root)) {
+              // element is already non-inert
+              return;
+            }
+
+            var _inertRoot = this._inertRoots.get(root);
+            _inertRoot.destructor();
+            this._inertRoots['delete'](root);
+            root.removeAttribute('inert');
+          }
+        }
+
+        /**
+         * Get the InertRoot object corresponding to the given inert root element, if any.
+         * @param {!Node} element
+         * @return {!InertRoot|undefined}
+         */
+
+      }, {
+        key: 'getInertRoot',
+        value: function getInertRoot(element) {
+          return this._inertRoots.get(element);
+        }
+
+        /**
+         * Register the given InertRoot as managing the given node.
+         * In the case where the node has a previously existing inert root, this inert root will
+         * be added to its set of inert roots.
+         * @param {!Node} node
+         * @param {!InertRoot} inertRoot
+         * @return {!InertNode} inertNode
+         */
+
+      }, {
+        key: 'register',
+        value: function register(node, inertRoot) {
+          var inertNode = this._managedNodes.get(node);
+          if (inertNode !== undefined) {
+            // node was already in an inert subtree
+            inertNode.addInertRoot(inertRoot);
+          } else {
+            inertNode = new InertNode(node, inertRoot);
+          }
+
+          this._managedNodes.set(node, inertNode);
+
+          return inertNode;
+        }
+
+        /**
+         * De-register the given InertRoot as managing the given inert node.
+         * Removes the inert root from the InertNode's set of managing inert roots, and remove the inert
+         * node from the InertManager's set of managed nodes if it is destroyed.
+         * If the node is not currently managed, this is essentially a no-op.
+         * @param {!Node} node
+         * @param {!InertRoot} inertRoot
+         * @return {?InertNode} The potentially destroyed InertNode associated with this node, if any.
+         */
+
+      }, {
+        key: 'deregister',
+        value: function deregister(node, inertRoot) {
+          var inertNode = this._managedNodes.get(node);
+          if (!inertNode) {
+            return null;
+          }
+
+          inertNode.removeInertRoot(inertRoot);
+          if (inertNode.destroyed) {
+            this._managedNodes['delete'](node);
+          }
+
+          return inertNode;
+        }
+
+        /**
+         * Callback used when document has finished loading.
+         */
+
+      }, {
+        key: '_onDocumentLoaded',
+        value: function _onDocumentLoaded() {
+          // Find all inert roots in document and make them actually inert.
+          var inertElements = slice.call(this._document.querySelectorAll('[inert]'));
+          inertElements.forEach(function (inertElement) {
+            this.setInert(inertElement, true);
+          }, this);
+
+          // Comment this out to use programmatic API only.
+          this._observer.observe(this._document.body || this._document.documentElement, { attributes: true, subtree: true, childList: true });
+        }
+
+        /**
+         * Callback used when mutation observer detects attribute changes.
+         * @param {!Array<!MutationRecord>} records
+         * @param {!MutationObserver} self
+         */
+
+      }, {
+        key: '_watchForInert',
+        value: function _watchForInert(records, self) {
+          var _this = this;
+          records.forEach(function (record) {
+            switch (record.type) {
+              case 'childList':
+                slice.call(record.addedNodes).forEach(function (node) {
+                  if (node.nodeType !== Node.ELEMENT_NODE) {
+                    return;
+                  }
+                  var inertElements = slice.call(node.querySelectorAll('[inert]'));
+                  if (matches.call(node, '[inert]')) {
+                    inertElements.unshift(node);
+                  }
+                  inertElements.forEach(function (inertElement) {
+                    this.setInert(inertElement, true);
+                  }, _this);
+                }, _this);
+                break;
+              case 'attributes':
+                if (record.attributeName !== 'inert') {
+                  return;
+                }
+                var target = /** @type {!HTMLElement} */record.target;
+                var inert = target.hasAttribute('inert');
+                _this.setInert(target, inert);
+                break;
+            }
+          }, this);
+        }
+      }]);
+
+      return InertManager;
+    }();
+
+    /**
+     * Recursively walk the composed tree from |node|.
+     * @param {!Node} node
+     * @param {(function (!HTMLElement))=} callback Callback to be called for each element traversed,
+     *     before descending into child nodes.
+     * @param {?ShadowRoot=} shadowRootAncestor The nearest ShadowRoot ancestor, if any.
+     */
+
+
+    function composedTreeWalk(node, callback, shadowRootAncestor) {
+      if (node.nodeType == Node.ELEMENT_NODE) {
+        var element = /** @type {!HTMLElement} */node;
+        if (callback) {
+          callback(element);
+        }
+
+        // Descend into node:
+        // If it has a ShadowRoot, ignore all child elements - these will be picked
+        // up by the <content> or <shadow> elements. Descend straight into the
+        // ShadowRoot.
+        var shadowRoot = /** @type {!HTMLElement} */element.shadowRoot;
+        if (shadowRoot) {
+          composedTreeWalk(shadowRoot, callback, shadowRoot);
+          return;
+        }
+
+        // If it is a <content> element, descend into distributed elements - these
+        // are elements from outside the shadow root which are rendered inside the
+        // shadow DOM.
+        if (element.localName == 'content') {
+          var content = /** @type {!HTMLContentElement} */element;
+          // Verifies if ShadowDom v0 is supported.
+          var distributedNodes = content.getDistributedNodes ? content.getDistributedNodes() : [];
+          for (var i = 0; i < distributedNodes.length; i++) {
+            composedTreeWalk(distributedNodes[i], callback, shadowRootAncestor);
+          }
+          return;
+        }
+
+        // If it is a <slot> element, descend into assigned nodes - these
+        // are elements from outside the shadow root which are rendered inside the
+        // shadow DOM.
+        if (element.localName == 'slot') {
+          var slot = /** @type {!HTMLSlotElement} */element;
+          // Verify if ShadowDom v1 is supported.
+          var _distributedNodes = slot.assignedNodes ? slot.assignedNodes({ flatten: true }) : [];
+          for (var _i = 0; _i < _distributedNodes.length; _i++) {
+            composedTreeWalk(_distributedNodes[_i], callback, shadowRootAncestor);
+          }
+          return;
+        }
+      }
+
+      // If it is neither the parent of a ShadowRoot, a <content> element, a <slot>
+      // element, nor a <shadow> element recurse normally.
+      var child = node.firstChild;
+      while (child != null) {
+        composedTreeWalk(child, callback, shadowRootAncestor);
+        child = child.nextSibling;
+      }
+    }
+
+    /**
+     * Adds a style element to the node containing the inert specific styles
+     * @param {!Node} node
+     */
+    function addInertStyle(node) {
+      if (node.querySelector('style#inert-style, link#inert-style')) {
+        return;
+      }
+      var style = document.createElement('style');
+      style.setAttribute('id', 'inert-style');
+      style.textContent = '\n' + '[inert] {\n' + '  pointer-events: none;\n' + '  cursor: default;\n' + '}\n' + '\n' + '[inert], [inert] * {\n' + '  -webkit-user-select: none;\n' + '  -moz-user-select: none;\n' + '  -ms-user-select: none;\n' + '  user-select: none;\n' + '}\n';
+      node.appendChild(style);
+    }
+
+    if (!HTMLElement.prototype.hasOwnProperty('inert')) {
+      /** @type {!InertManager} */
+      var inertManager = new InertManager(document);
+
+      Object.defineProperty(HTMLElement.prototype, 'inert', {
+        enumerable: true,
+        /** @this {!HTMLElement} */
+        get: function get() {
+          return this.hasAttribute('inert');
+        },
+        /** @this {!HTMLElement} */
+        set: function set(inert) {
+          inertManager.setInert(this, inert);
+        }
+      });
+    }
+  })();
+
+})));

wp-includes/js/dist/vendor/wp-polyfill-node-contains.js

@@ -0,0 +1,34 @@
+
+// Node.prototype.contains
+(function() {
+
+	function contains(node) {
+		if (!(0 in arguments)) {
+			throw new TypeError('1 argument is required');
+		}
+
+		do {
+			if (this === node) {
+				return true;
+			}
+		// eslint-disable-next-line no-cond-assign
+		} while (node = node && node.parentNode);
+
+		return false;
+	}
+
+	// IE
+	if ('HTMLElement' in self && 'contains' in HTMLElement.prototype) {
+		try {
+			delete HTMLElement.prototype.contains;
+		// eslint-disable-next-line no-empty
+		} catch (e) {}
+	}
+
+	if ('Node' in self) {
+		Node.prototype.contains = contains;
+	} else {
+		document.contains = Element.prototype.contains = contains;
+	}
+
+}());

wp-includes/js/dist/vendor/wp-polyfill-node-contains.min.js

@@ -0,0 +1 @@
+!function(){function e(e){if(!(0 in arguments))throw new TypeError("1 argument is required");do{if(this===e)return!0}while(e=e&&e.parentNode);return!1}if("HTMLElement"in self&&"contains"in HTMLElement.prototype)try{delete HTMLElement.prototype.contains}catch(e){}"Node"in self?Node.prototype.contains=e:document.contains=Element.prototype.contains=e}();

wp-includes/js/dist/vendor/wp-polyfill-object-fit.js

@@ -0,0 +1,304 @@
+/*----------------------------------------
+ * objectFitPolyfill 2.3.5
+ *
+ * Made by Constance Chen
+ * Released under the ISC license
+ *
+ * https://github.com/constancecchen/object-fit-polyfill
+ *--------------------------------------*/
+
+(function() {
+  'use strict';
+
+  // if the page is being rendered on the server, don't continue
+  if (typeof window === 'undefined') return;
+
+  // Workaround for Edge 16-18, which only implemented object-fit for <img> tags
+  var edgeMatch = window.navigator.userAgent.match(/Edge\/(\d{2})\./);
+  var edgeVersion = edgeMatch ? parseInt(edgeMatch[1], 10) : null;
+  var edgePartialSupport = edgeVersion
+    ? edgeVersion >= 16 && edgeVersion <= 18
+    : false;
+
+  // If the browser does support object-fit, we don't need to continue
+  var hasSupport = 'objectFit' in document.documentElement.style !== false;
+  if (hasSupport && !edgePartialSupport) {
+    window.objectFitPolyfill = function() {
+      return false;
+    };
+    return;
+  }
+
+  /**
+   * Check the container's parent element to make sure it will
+   * correctly handle and clip absolutely positioned children
+   *
+   * @param {node} $container - parent element
+   */
+  var checkParentContainer = function($container) {
+    var styles = window.getComputedStyle($container, null);
+    var position = styles.getPropertyValue('position');
+    var overflow = styles.getPropertyValue('overflow');
+    var display = styles.getPropertyValue('display');
+
+    if (!position || position === 'static') {
+      $container.style.position = 'relative';
+    }
+    if (overflow !== 'hidden') {
+      $container.style.overflow = 'hidden';
+    }
+    // Guesstimating that people want the parent to act like full width/height wrapper here.
+    // Mostly attempts to target <picture> elements, which default to inline.
+    if (!display || display === 'inline') {
+      $container.style.display = 'block';
+    }
+    if ($container.clientHeight === 0) {
+      $container.style.height = '100%';
+    }
+
+    // Add a CSS class hook, in case people need to override styles for any reason.
+    if ($container.className.indexOf('object-fit-polyfill') === -1) {
+      $container.className = $container.className + ' object-fit-polyfill';
+    }
+  };
+
+  /**
+   * Check for pre-set max-width/height, min-width/height,
+   * positioning, or margins, which can mess up image calculations
+   *
+   * @param {node} $media - img/video element
+   */
+  var checkMediaProperties = function($media) {
+    var styles = window.getComputedStyle($media, null);
+    var constraints = {
+      'max-width': 'none',
+      'max-height': 'none',
+      'min-width': '0px',
+      'min-height': '0px',
+      top: 'auto',
+      right: 'auto',
+      bottom: 'auto',
+      left: 'auto',
+      'margin-top': '0px',
+      'margin-right': '0px',
+      'margin-bottom': '0px',
+      'margin-left': '0px',
+    };
+
+    for (var property in constraints) {
+      var constraint = styles.getPropertyValue(property);
+
+      if (constraint !== constraints[property]) {
+        $media.style[property] = constraints[property];
+      }
+    }
+  };
+
+  /**
+   * Calculate & set object-position
+   *
+   * @param {string} axis - either "x" or "y"
+   * @param {node} $media - img or video element
+   * @param {string} objectPosition - e.g. "50% 50%", "top left"
+   */
+  var setPosition = function(axis, $media, objectPosition) {
+    var position, other, start, end, side;
+    objectPosition = objectPosition.split(' ');
+
+    if (objectPosition.length < 2) {
+      objectPosition[1] = objectPosition[0];
+    }
+
+    /* istanbul ignore else */
+    if (axis === 'x') {
+      position = objectPosition[0];
+      other = objectPosition[1];
+      start = 'left';
+      end = 'right';
+      side = $media.clientWidth;
+    } else if (axis === 'y') {
+      position = objectPosition[1];
+      other = objectPosition[0];
+      start = 'top';
+      end = 'bottom';
+      side = $media.clientHeight;
+    } else {
+      return; // Neither x or y axis specified
+    }
+
+    if (position === start || other === start) {
+      $media.style[start] = '0';
+      return;
+    }
+
+    if (position === end || other === end) {
+      $media.style[end] = '0';
+      return;
+    }
+
+    if (position === 'center' || position === '50%') {
+      $media.style[start] = '50%';
+      $media.style['margin-' + start] = side / -2 + 'px';
+      return;
+    }
+
+    // Percentage values (e.g., 30% 10%)
+    if (position.indexOf('%') >= 0) {
+      position = parseInt(position, 10);
+
+      if (position < 50) {
+        $media.style[start] = position + '%';
+        $media.style['margin-' + start] = side * (position / -100) + 'px';
+      } else {
+        position = 100 - position;
+        $media.style[end] = position + '%';
+        $media.style['margin-' + end] = side * (position / -100) + 'px';
+      }
+
+      return;
+    }
+    // Length-based values (e.g. 10px / 10em)
+    else {
+      $media.style[start] = position;
+    }
+  };
+
+  /**
+   * Calculate & set object-fit
+   *
+   * @param {node} $media - img/video/picture element
+   */
+  var objectFit = function($media) {
+    // IE 10- data polyfill
+    var fit = $media.dataset
+      ? $media.dataset.objectFit
+      : $media.getAttribute('data-object-fit');
+    var position = $media.dataset
+      ? $media.dataset.objectPosition
+      : $media.getAttribute('data-object-position');
+
+    // Default fallbacks
+    fit = fit || 'cover';
+    position = position || '50% 50%';
+
+    // If necessary, make the parent container work with absolutely positioned elements
+    var $container = $media.parentNode;
+    checkParentContainer($container);
+
+    // Check for any pre-set CSS which could mess up image calculations
+    checkMediaProperties($media);
+
+    // Reset any pre-set width/height CSS and handle fit positioning
+    $media.style.position = 'absolute';
+    $media.style.width = 'auto';
+    $media.style.height = 'auto';
+
+    // `scale-down` chooses either `none` or `contain`, whichever is smaller
+    if (fit === 'scale-down') {
+      if (
+        $media.clientWidth < $container.clientWidth &&
+        $media.clientHeight < $container.clientHeight
+      ) {
+        fit = 'none';
+      } else {
+        fit = 'contain';
+      }
+    }
+
+    // `none` (width/height auto) and `fill` (100%) and are straightforward
+    if (fit === 'none') {
+      setPosition('x', $media, position);
+      setPosition('y', $media, position);
+      return;
+    }
+
+    if (fit === 'fill') {
+      $media.style.width = '100%';
+      $media.style.height = '100%';
+      setPosition('x', $media, position);
+      setPosition('y', $media, position);
+      return;
+    }
+
+    // `cover` and `contain` must figure out which side needs covering, and add CSS positioning & centering
+    $media.style.height = '100%';
+
+    if (
+      (fit === 'cover' && $media.clientWidth > $container.clientWidth) ||
+      (fit === 'contain' && $media.clientWidth < $container.clientWidth)
+    ) {
+      $media.style.top = '0';
+      $media.style.marginTop = '0';
+      setPosition('x', $media, position);
+    } else {
+      $media.style.width = '100%';
+      $media.style.height = 'auto';
+      $media.style.left = '0';
+      $media.style.marginLeft = '0';
+      setPosition('y', $media, position);
+    }
+  };
+
+  /**
+   * Initialize plugin
+   *
+   * @param {node} media - Optional specific DOM node(s) to be polyfilled
+   */
+  var objectFitPolyfill = function(media) {
+    if (typeof media === 'undefined' || media instanceof Event) {
+      // If left blank, or a default event, all media on the page will be polyfilled.
+      media = document.querySelectorAll('[data-object-fit]');
+    } else if (media && media.nodeName) {
+      // If it's a single node, wrap it in an array so it works.
+      media = [media];
+    } else if (typeof media === 'object' && media.length && media[0].nodeName) {
+      // If it's an array of DOM nodes (e.g. a jQuery selector), it's fine as-is.
+      media = media;
+    } else {
+      // Otherwise, if it's invalid or an incorrect type, return false to let people know.
+      return false;
+    }
+
+    for (var i = 0; i < media.length; i++) {
+      if (!media[i].nodeName) continue;
+
+      var mediaType = media[i].nodeName.toLowerCase();
+
+      if (mediaType === 'img') {
+        if (edgePartialSupport) continue; // Edge supports object-fit for images (but nothing else), so no need to polyfill
+
+        if (media[i].complete) {
+          objectFit(media[i]);
+        } else {
+          media[i].addEventListener('load', function() {
+            objectFit(this);
+          });
+        }
+      } else if (mediaType === 'video') {
+        if (media[i].readyState > 0) {
+          objectFit(media[i]);
+        } else {
+          media[i].addEventListener('loadedmetadata', function() {
+            objectFit(this);
+          });
+        }
+      } else {
+        objectFit(media[i]);
+      }
+    }
+
+    return true;
+  };
+
+  if (document.readyState === 'loading') {
+    // Loading hasn't finished yet
+    document.addEventListener('DOMContentLoaded', objectFitPolyfill);
+  } else {
+    // `DOMContentLoaded` has already fired
+    objectFitPolyfill();
+  }
+
+  window.addEventListener('resize', objectFitPolyfill);
+
+  window.objectFitPolyfill = objectFitPolyfill;
+})();

wp-includes/js/dist/vendor/wp-polyfill-object-fit.min.js

@@ -0,0 +1 @@
+!function(){"use strict";if("undefined"!=typeof window){var t=window.navigator.userAgent.match(/Edge\/(\d{2})\./),e=t?parseInt(t[1],10):null,i=!!e&&16<=e&&e<=18;if("objectFit"in document.documentElement.style==0||i){var n=function(t,e,i){var n,o,l,a,d;if((i=i.split(" ")).length<2&&(i[1]=i[0]),"x"===t)n=i[0],o=i[1],l="left",a="right",d=e.clientWidth;else{if("y"!==t)return;n=i[1],o=i[0],l="top",a="bottom",d=e.clientHeight}if(n!==l&&o!==l){if(n!==a&&o!==a)return"center"===n||"50%"===n?(e.style[l]="50%",void(e.style["margin-"+l]=d/-2+"px")):void(0<=n.indexOf("%")?(n=parseInt(n,10))<50?(e.style[l]=n+"%",e.style["margin-"+l]=d*(n/-100)+"px"):(n=100-n,e.style[a]=n+"%",e.style["margin-"+a]=d*(n/-100)+"px"):e.style[l]=n);e.style[a]="0"}else e.style[l]="0"},o=function(t){var e=t.dataset?t.dataset.objectFit:t.getAttribute("data-object-fit"),i=t.dataset?t.dataset.objectPosition:t.getAttribute("data-object-position");e=e||"cover",i=i||"50% 50%";var o=t.parentNode;return function(t){var e=window.getComputedStyle(t,null),i=e.getPropertyValue("position"),n=e.getPropertyValue("overflow"),o=e.getPropertyValue("display");i&&"static"!==i||(t.style.position="relative"),"hidden"!==n&&(t.style.overflow="hidden"),o&&"inline"!==o||(t.style.display="block"),0===t.clientHeight&&(t.style.height="100%"),-1===t.className.indexOf("object-fit-polyfill")&&(t.className=t.className+" object-fit-polyfill")}(o),function(t){var e=window.getComputedStyle(t,null),i={"max-width":"none","max-height":"none","min-width":"0px","min-height":"0px",top:"auto",right:"auto",bottom:"auto",left:"auto","margin-top":"0px","margin-right":"0px","margin-bottom":"0px","margin-left":"0px"};for(var n in i)e.getPropertyValue(n)!==i[n]&&(t.style[n]=i[n])}(t),t.style.position="absolute",t.style.width="auto",t.style.height="auto","scale-down"===e&&(e=t.clientWidth<o.clientWidth&&t.clientHeight<o.clientHeight?"none":"contain"),"none"===e?(n("x",t,i),void n("y",t,i)):"fill"===e?(t.style.width="100%",t.style.height="100%",n("x",t,i),void n("y",t,i)):(t.style.height="100%",void("cover"===e&&t.clientWidth>o.clientWidth||"contain"===e&&t.clientWidth<o.clientWidth?(t.style.top="0",t.style.marginTop="0",n("x",t,i)):(t.style.width="100%",t.style.height="auto",t.style.left="0",t.style.marginLeft="0",n("y",t,i))))},l=function(t){if(void 0===t||t instanceof Event)t=document.querySelectorAll("[data-object-fit]");else if(t&&t.nodeName)t=[t];else if("object"!=typeof t||!t.length||!t[0].nodeName)return!1;for(var e=0;e<t.length;e++)if(t[e].nodeName){var n=t[e].nodeName.toLowerCase();if("img"===n){if(i)continue;t[e].complete?o(t[e]):t[e].addEventListener("load",(function(){o(this)}))}else"video"===n?0<t[e].readyState?o(t[e]):t[e].addEventListener("loadedmetadata",(function(){o(this)})):o(t[e])}return!0};"loading"===document.readyState?document.addEventListener("DOMContentLoaded",l):l(),window.addEventListener("resize",l),window.objectFitPolyfill=l}else window.objectFitPolyfill=function(){return!1}}}();