What does the “$depth” parameter in the Walker_Comment stand for?

The $depth parameter in the walker class is used for outputting and padding the output. You can use it to format your HTML structure. For example:

<div class="comment-meta post-meta cmnt-padding-<?php echo $depth ;?>" role="complementary">

which will output an extra class for your comment wrapper, that you can use to style your comments.

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