CSS3 Gradients are now available in Internet Explorer 10 Platform Preview 1!
"CSS3 Gradients comes from a subsection of the CSS3 Image Values and Replaced Content specification, which is still in Working Draft status. Using CSS markup, a gradient image is generated by the browser and can be rendered where CSS images are permitted. In PP1, CSS3 gradients can be used as a background-image."
"IE10 PP1 doesn't support color interpolation in the premultiplied alpha color space. This means that interpolation between rgba() color stops with different alpha values will appear less attractive than it otherwise should be. This's particularly noticeable with a black, alpha value 0, color stop. When transitioning to a transparent black color stop, the color transition will appear to fade to a black color before becoming transparent, instead of fading directly to more aesthetically pleasing transparent.
IE10 will support color interpolation in the premultiplied color space. This'll become available in a future Platform Preview.
Additionally, support for CSS gradients in list-style-image and generated content will be available in IE10 and future preview. Also bear in mind that repeating gradients in PP1-available using -ms-repeating-linear-gradient and -ms-repeating-radial-gradient in place of -ms-linear-gradient and -ms-radial-gradient-reflect the gradient instead of repeating it. This, too, will be fixed in IE10," Ie team blog infomrs.
[Source: Ie blog]