Aside from producing markup that's difficult to read, could there be any unexpected problems parsing html documents to exclude all spaces between ">" and "<"?
I haven't run the following code, but I think it would do it in Perl. $html_text =~ s/(>)\s+(<)/$1$2/g;
"What I'd really like to know is if there are cases where it would somehow make sense to have space between ">" and "<" characters" Not that I can think of offhand. It might affect JavaScript, but you can (and should) include that from a separate file.
I can't think of any particular problems, other than those if you have anything between <pre></pre> tags (which retains the formatting including the souse-code white space).
If you know the content of the pages and you're sure you haven't used
<pre></pre> anywhere, I'd say go ahead - but keep a backup of the old stuff!