I've finished a first cut at a subclass of PPI::HTML that applies some tag compression, and adds support for code folding. For the curious, check the homepage that has a link to example output.

I'd appreciate

• any feedback on the layout and/or folding interface, as I'm planning on using this in a browser based debugger

• (OTish) some insight into an issue with Firefox (both 1.5 and 2.0).

  I use perl5db.pl as a stress test; while the compression works fairly well (relative to PPI::HTML), the output generates a very large number of spans (8500+), and the resulting behavior in Firefox is terrible. IE6 and Safari 2.0.4 handle it fairly well. I know FF has some performance problems, but couldn't google up a specific reference to large numbers of spans being an issue. If any monk can shed some light on the issue (or knows a URL where I might find the answer), I'd be much obliged.

Update:
After some further diagnosis, I seem to have solved (at least partially) the FF issue. Either FF hates tabs, or has issues parsing CSS. After updating CodeFolder to expand tabs in the HTML, and injecting a dummy CSS class at the beginning of the CSS, FF now behaves much better on perl5db's folded output.

As a regular FF user, I must say I'm getting a bit nervous about some of the flaky bugs I'm finding in it...e.g, in a <pre> section, a single quote at the end of a line causes FF to alter the output line-height of the next line. (Fortunately, I was able to <span> the problem away, but its still a bit odd)