WP_HTML_Tag_Processor::seek( string $bookmark_name ): bool

Source

	/*
	 * Otherwise, append it to the new "class" attribute value.
	 *
	 * There are options for handling whitespace between tags.
	 * Preserving the existing whitespace produces fewer changes
	 * to the HTML content and should clarify the before/after
	 * content when debugging the modified output.
	 *
	 * This approach contrasts normalizing the inter-class
	 * whitespace to a single space, which might appear cleaner
	 * in the output HTML but produce a noisier change.
	 */
	if ( '' !== $class ) {
		$class .= substr( $existing_class, $ws_at, $ws_length );
	}
	$class .= $name;
}

// Add new classes by appending those which haven't already been seen.
foreach ( $this->classname_updates as $name => $operation ) {
	$comparable_name = $is_quirks ? strtolower( $name ) : $name;
	if ( self::ADD_CLASS === $operation && ! in_array( $comparable_name, $seen, true ) ) {
		$modified = true;

		$class .= strlen( $class ) > 0 ? ' ' : '';
		$class .= $name;

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