I am using CSS3Pie . This is the .htc file that you host on the server that provides multi-threading for many CSS3 style elements such as border radius, text shadows, shadow shadows and gradients. This is very convenient in that it solves many of the same problems for IE8 and IE9.
It can be a little tricky to configure so that you sometimes need to determine the MIME type on your server for .htc, and you have to make sure that you set the path in your CSS file to where the .htc file is located, besides that, it's great.
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