Do you mean you are already escaping the HTML, so that the tags are visible as plaintext, but that is not to your liking? If so, a simple s/<[^>]*>//sgi on the unescaped(!) content will do what you're asking for - of course, for anything with tables, or when the content is positioned via CSS, the result will likely be quite unrecognizable.

Makeshifts last the longest.