This looks interesting
http://try.powermapper.com/Demo/SortSite
Tested:
My day job website - PHP / HTML site - worked fine - everything was clear back to IE 7. Chrome, Firefox, Safari were all fine
My side project - AngularJS 1.x - worked fine - Critical issues in IE 7 (which I know about), IE 8+ pass. Everything else was fine.
After you scan, click View Report, Then Issues tab, then compatibility to see the browser results.