Note: The original post was published March 19 2010. The original article’s CSS3 emulator of choice was CurvyCorners
When someone uses the words “rounded corners” and “IE” in the same paragraph, rest assured a puppy has died somewhere.
There are a few ways to achieve rounded corners in IE, unfortunately none of them are pain free. I usually like to use rounded corners as progressive enhancement, so IE8 and lower just have to deal with square corners. Luckily, IE9 has been released and it supports the
border-radius CSS property. IE10 is already on the way and it should be released sometime at the end of this year. Go Microsoft.