Ask HN: What browsers do you support?
What browsers do you support? How do you use to test against the browsers you support?
Suggestion to avoid falling into the trap of wasting a huge swath of time on fixing stuff for IE: test often. Really often. Test your approach as soon as you can, so that if you find that your approach isn't working, you'll catch it early and can avoid using the same approach in the future and have to fix it everywhere once noticed.