Comment 21 for bug 256624

(In reply to comment #17)
> Ben, it sounds like you want to test this using a reftest instead of a
> mochitest.

From http://developer.mozilla.org/en/docs/Creating_reftest-based_unit_tests:

"So, if the effect of complex markup is being tested, put that complex markup into a page and create another page that uses simple markup to achieve the same visual effect. Reftest will then compare them and verify whether they produce the same visual construct."

That's just what I need. Thanks!