You can do this in the comments loop:
if( empty( $comment->comment_parent ) ) { //if the comment does not have a parent, then it is L1
echo 'my-custom-html';
}
You can do this in the comments loop:
if( empty( $comment->comment_parent ) ) { //if the comment does not have a parent, then it is L1
echo 'my-custom-html';
}