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wp-includes/html-api/class-wp-html-unsupported-exception.php

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+<?php
+/**
+ * HTML API: WP_HTML_Unsupported_Exception class
+ *
+ * @package WordPress
+ * @subpackage HTML-API
+ * @since 6.4.0
+ */
+
+/**
+ * Core class used by the HTML processor during HTML parsing
+ * for indicating that a given operation is unsupported.
+ *
+ * This class is designed for internal use by the HTML processor.
+ *
+ * The HTML API aims to operate in compliance with the HTML5
+ * specification, but does not implement the full specification.
+ * In cases where it lacks support it should not cause breakage
+ * or unexpected behavior. In the cases where it recognizes that
+ * it cannot proceed, this class is used to abort from any
+ * operation and signify that the given HTML cannot be processed.
+ *
+ * @since 6.4.0
+ *
+ * @access private
+ *
+ * @see WP_HTML_Processor
+ */
+class WP_HTML_Unsupported_Exception extends Exception {
+
+}