comment anchor
From Textpattern CMS User Documentation
<txp:comment_anchor />
The comment_anchor tag is a single tag which is used to produce an empty anchor tag with an id attribute reflecting the comment ID. Used in the form that renders your comments (the default form is named "comments").
Attributes
This tag has no attributes.
Examples
Example 1: Generate current comment anchor
When the comment number is 000005 you will see:
<a id="c000005"></a>
