Added rounded border support for IE

[dmyers]

No description provided.

[tbassetto]

I can't find any proof that IE supports -ms-border-radius. When they introduced IE9, they made it clear that border-radius was working without vendor prefix.

[dmyers]

Yes it appears you are right. I had thought that was needed a while back before IE9, but oh well.
http://jsfiddle.net/4bTMk/

When I viewed the bootstrap docs in IE9, I didn't see them rounded which made me think that was needed.
http://jsfiddle.net/2tBEH/

[dmyers]

Okay I finally found what is causing it and it is this line:
https://github.com/twitter/bootstrap/blob/master/lib/patterns.less#L596

[dmyers]

I didn't meant to close it I was just hoping to get feedback on what to do.

@fat are the :root lines meant to block IE from rounding the buttons?

[fat]

mark and i opted to not have rounded corners in ie because of a gradient clipping issue.

[mdo]

Yup, it's in the comments for the Less files. Gradients bleed through in IE9 which sucks. So we used some jank-a-lank to get around that for no.