None - sorry to disappoint you, but There Is No Silver Bullet. To be safe, you still need to fully test in all A-grade browsers (this is a moving target, yes; c

None - sorry to disappoint you, but There Is No Silver Bullet. To be safe, you still need to fully test in all A-grade browsers (this is a moving target, yes; currently the bare minimum is FF,Chrome,IE). In my experience, whatever browser you work in, expect the result to work with other A-grade browsers in 90% of functionality. Sometimes it may happen to be 80%, sometimes 95%, but three nines ("99.9") is an unreasonably high expectation. And of course, then there's the special browser : IE. Current versions are juuust about bearable, but users on WinXP are stuck with IE8. Is it worth the effort to have the site look good there, is it worth the effort to have the site kinda work there while looking somewhat ugly, or should you just leave them in the dust? Not really a technical question...