Currently all html comments are filtered out of the extraction, but conditional comments may contain scripts, css, or other elements specific to certain versions of IE.
Conditional comments are used by some versions of Internet Explorer to allow html specific to a browser version to be ignored by other browsers/versions
Typical HTML Comment:
<!-- Comment content -->
Conditional HTML comment:
There is another syntax for conditional comments which already gets parsed by the regex since it doesn't start with "<!--"