wp-includes/class-walker-comment.php:55Starts the list before the elements are added.
$outputstring$depthintoptional0$argsarrayoptionalarray() public function start_lvl( &$output, $depth = 0, $args = array() ) { $GLOBALS['comment_depth'] = $depth + 1; switch ( $args['style'] ) { case 'div': break; case 'ol': $output .= '<ol class="children">' . "\n"; break; case 'ul': default: $output .= '<ul class="children">' . "\n"; break; } }Introduced in 2.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-walker-comment.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.