Why you shouldn’t use HTML comments that begin with a # (hash) symbol on Apache

Published March 5th, 2008

…because it mistakes them for mod_include directives (if it’s enabled) and attempts to parse them as such. When this fails, it replaces them with the text ‘[an error occurred while processing this directive]‘.

So don’t do this, for example:

<!-- #1 -->
First

<!-- #2 -->
Second

<!-- #3 -->
Third

Oops.

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