Comments

Template::HAML supports three forms of comments: HTML comments, conditional comments, and silent comments.

HTML comments — /#

A line beginning with / is rendered as an HTML comment.

Single-line form:

/ Hello

<!-- Hello -->

If the / line has children indented underneath, they are rendered inside the comment block:

/
  %p hi

<!--
  <p>hi</p>
-->

Conditional comments — /[expr]#

Use /[expr] to emit a conditional comment. The bracketed text becomes the condition; surrounding whitespace is stripped.

Inline form:

/[if IE] text

<!--[if IE]>text<![endif]-->

Block form:

/[if IE]
  %p ie only

<!--[if IE]>
  <p>ie only</p>
<![endif]-->

Negated:

/[if !IE] text

<!--[if !IE]>text<![endif]-->

Revealed conditional comments — /![expr]#

Prefix the bracket with ! to emit a downlevel-revealed conditional comment. Browsers that don't honor the condition see the wrapped content as plain markup:

/![if !IE] text

<!--[if !IE]><!-->text<!--<![endif]-->

Silent comments — -##

A line beginning with -# is suppressed entirely. Any indented body — including any number of blank lines — is treated as opaque text and produces no output:

%p hi
-# notes:
   arbitrary text $^&* not parsed as HAML
   !!! also opaque
%p bye

<p>hi</p>
<p>bye</p>

Because the body is opaque, you can drop in non-HAML content (e.g. design notes, stale code, scratch markup) without provoking parse errors.