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wp-includes/theme-compat/embed-404.php

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+<?php
+/**
+ * Contains the post embed content template part
+ *
+ * When a post is embedded in an iframe, this file is used to create the content template part
+ * output if the active theme does not include an embed-404.php template.
+ *
+ * @package WordPress
+ * @subpackage Theme_Compat
+ * @since 4.5.0
+ */
+?>
+<div class="wp-embed">
+	<p class="wp-embed-heading"><?php _e( 'Oops! That embed cannot be found.' ); ?></p>
+
+	<div class="wp-embed-excerpt">
+		<p>
+			<?php
+			printf(
+				/* translators: %s: A link to the embedded site. */
+				__( 'It looks like nothing was found at this location. Maybe try visiting %s directly?' ),
+				'<strong><a href="' . esc_url( home_url() ) . '">' . esc_html( get_bloginfo( 'name' ) ) . '</a></strong>'
+			);
+			?>
+		</p>
+	</div>
+
+	<?php
+	/** This filter is documented in wp-includes/theme-compat/embed-content.php */
+	do_action( 'embed_content' );
+	?>
+
+	<div class="wp-embed-footer">
+		<?php the_embed_site_title(); ?>
+	</div>
+</div>