Debugging css in the html rendering engine

[Macho Philipovich]

Hi again,

Unrelated invoice issue: what engine does Gnucash use to render html,
and is there any way to debug it with an "inspect element"-like tool?

I'm having trouble getting the css to do what I want, and yet when I
"Export HTML-formatted report to file" and open it in Firefox, my
invoice renders just fine, the way I intended! (Exporting every invoice
is not an option, for a few reasons.)

Is there some browser that I could install that shares the rendering
engine with Gnucash and that provides any debug tools?

In case the context is somehow significant, I've been building my own
css and scm files to use with the tax invoice report and they look
great, with one small exception: there's a small bit that's not
rendering as intended.

Thanks, as always!

Macho