Formatting: Revert pre-save filter adding `rel="noopener"`.

Removes filters adding `rel="noopener"` to links targeting `_blank`.

Previous implementation could introduce blank `rel` attributes and could corrupt JSON data when saving via the customizer.

See #43187.
Reverts [43732] and [43733] from the 5.0 branch.


Built from https://develop.svn.wordpress.org/branches/5.0@43930


git-svn-id: http://core.svn.wordpress.org/branches/5.0@43762 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/default-filters.php

@@ -118,21 +118,6 @@ foreach ( array( 'content_save_pre', 'excerpt_save_pre', 'comment_save_pre', 'pr
 	add_filter( $filter, 'balanceTags', 50 );
 }
 
-// Add proper rel values for links with target.
-foreach ( array(
-	'title_save_pre',
-	'content_save_pre',
-	'excerpt_save_pre',
-	'content_filtered_save_pre',
-	'pre_comment_content',
-	'pre_term_description',
-	'pre_link_description',
-	'pre_link_notes',
-	'pre_user_description',
-) as $filter ) {
-	add_filter( $filter, 'wp_targeted_link_rel' );
-};
-
 // Format strings for display.
 foreach ( array( 'comment_author', 'term_name', 'link_name', 'link_description', 'link_notes', 'bloginfo', 'wp_title', 'widget_title' ) as $filter ) {
 	add_filter( $filter, 'wptexturize'   );

wp-includes/formatting.php

@@ -2773,69 +2773,6 @@ function wp_rel_nofollow_callback( $matches ) {
 	return "<a $text rel=\"$rel\">";
 }
 
-/**
- * Adds rel noreferrer and noopener to all HTML A elements that have a target.
- *
- * @param string $text Content that may contain HTML A elements.
- * @return string Converted content.
- */
-function wp_targeted_link_rel( $text ) {
-	// Don't run (more expensive) regex if no links with targets.
-	if ( stripos( $text, 'target' ) !== false && stripos( $text, '<a ' ) !== false ) {
-		$text = preg_replace_callback( '|<a\s([^>]*target\s*=[^>]*)>|i', 'wp_targeted_link_rel_callback', $text );
-	}
-
-	return $text;
-}
-
-/**
- * Callback to add rel="noreferrer noopener" string to HTML A element.
- *
- * Will not duplicate existing noreferrer and noopener values
- * to prevent from invalidating the HTML.
- *
- * @param array $matches Single Match
- * @return string HTML A Element with rel noreferrer noopener in addition to any existing values
- */
-function wp_targeted_link_rel_callback( $matches ) {
-	$link_html = $matches[1];
-	$rel_match = array();
-
-	/**
-	 * Filters the rel values that are added to links with `target` attribute.
-	 *
-	 * @since 5.0.0
-	 *
-	 * @param string The rel values.
-	 * @param string $link_html The matched content of the link tag including all HTML attributes.
-	 */
-	$rel = apply_filters( 'wp_targeted_link_rel', 'noopener noreferrer', $link_html );
-
-	// Value with delimiters, spaces around are optional.
-	$attr_regex = '|rel\s*=\s*?(\\\\{0,1}["\'])(.*?)\\1|i';
-	preg_match( $attr_regex, $link_html, $rel_match );
-
-	if ( empty( $rel_match[0] ) ) {
-		// No delimiters, try with a single value and spaces, because `rel =  va"lue` is totally fine...
-		$attr_regex = '|rel\s*=(\s*)([^\s]*)|i';
-		preg_match( $attr_regex, $link_html, $rel_match );
-	}
-
-	if ( ! empty( $rel_match[0] ) ) {
-		$parts = preg_split( '|\s+|', strtolower( $rel_match[2] ) );
-		$parts = array_map( 'esc_attr', $parts );
-		$needed = explode( ' ', $rel );
-		$parts = array_unique( array_merge( $parts, $needed ) );
-		$delimiter = trim( $rel_match[1] ) ? $rel_match[1] : '"';
-		$rel = 'rel=' . $delimiter . trim( implode( ' ', $parts ) ) . $delimiter;
-		$link_html = str_replace( $rel_match[0], $rel, $link_html );
-	} else {
-		$link_html .= " rel=\"$rel\"";
-	}
-
-	return "<a $link_html>";
-}
-
 /**
  * Convert one smiley code to the icon graphic file equivalent.
  *

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-beta5-43929';
+$wp_version = '5.0-beta5-43930';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.