Well, not everything:

<div class="<!-- TMPL_VAR NAME=PARAM2 -->">Test</div>

Comment tags will validate as long as they are used outside of HTML tags.


In reply to Re^3: Checkstyle For HTML Templates by cees
in thread Checkstyle For HTML Templates by vishi83

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":