wp-includes/formatting.php:3317Adds rel="noopener" to all HTML A elements that have a target.
$textstringstringfunction wp_targeted_link_rel( $text ) { _deprecated_function( __FUNCTION__, '6.7.0' ); // Don't run (more expensive) regex if no links with targets. if ( stripos( $text, 'target' ) === false || stripos( $text, '<a ' ) === false || is_serialized( $text ) ) { return $text; } $script_and_style_regex = '/<(script|style).*?<\/\\1>/si'; preg_match_all( $script_and_style_regex, $text, $matches ); $extra_parts = $matches[0]; $html_parts = preg_split( $script_and_style_regex, $text ); foreach ( $html_parts as &$part ) { $part = preg_replace_callback( '|<a\s([^>]*target\s*=[^>]*)>|i', 'wp_targeted_link_rel_callback', $part ); } $text = ''; for ( $i = 0; $i < count( $html_parts ); $i++ ) { $text .= $html_parts[ $i ]; if ( isset( $extra_parts[ $i ] ) ) { $text .= $extra_parts[ $i ]; } } return $text;}Introduced in 5.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/formatting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.