IE9's global share is 2.13% and 3.84% in the US. It's 2.38% for the sites I'm supporting. Here's the simple answer for supporting old IE: http://dowebsitesneed

IE9's global share is 2.13% and 3.84% in the US. It's 2.38% for the sites I'm supporting. Here's the simple answer for supporting old IE: http://dowebsitesneedtolookexactlythesameineverybrowser.com/ http://dowebsitesneedtolookexactlythesameineverybrowser.com/ But to be more precise, graceful degradation is the answer. I'm building an interface that needs to last for several years, and IE9 is circling the drain. I can't justify making too many decisions around browsers that will be gone soon at the expense of the experience in all the browsers that fully support modern properties now. IE 8 and 9 will get a degraded experience, but the content will all still be there, and it will look pretty good. But it won't look exactly the same.