Comments
Like tags, buffered comments must appear on their own line.
<p>foo</p>
<p>bar</p>
These are only for commenting on the Pug code itself, and do not appear in the rendered HTML.
<p>foo</p>
<p>bar</p>
<!--Comments for your HTML readers.
</body>
Conditional Comments
Pug does not have any special syntax for conditional comments. (Conditional comments are a peculiar method of adding fallback markup for old versions of Internet Explorer.)
<!DOCTYPE html>
<!--[if IE 8]>
<html lang="en" class="lt-ie9">
<![endif]-->
<!--<![endif]-->
<body>
<p>Supporting old web browsers is a pain.</p>
</body>