嗯，黄色来自

<tr class="unapproved">

参见示例。single_row() 在里面wp-admin/includes/class-wp-comments-list-table.php:

function single_row( $a_comment ) {
                global $post, $comment;

                $comment = $a_comment;
                $the_comment_class = join( \' \', get_comment_class( wp_get_comment_status( $comment->comment_ID ) ) );

                $post = get_post( $comment->comment_post_ID );

                $this->user_can = current_user_can( \'edit_comment\', $comment->comment_ID );

                echo "<tr id=\'comment-$comment->comment_ID\' class=\'$the_comment_class\'>";
                echo $this->single_row_columns( $comment );
                echo "</tr>\\n";
        }