The development team of Internet Explorer 7 have published a post indicating the “improvements” of the new browser. Useful improvements for the CSS design and that only work under the <! DOCTYPE> switch, this to preserve the compatibility with IE’s previous versions.

Between the changes, I find five essential ones:

• Support of Min/max width/height (ideal for designs with images)
• To show transparent PNG (alpha channel support)
• To show: hover in all the elements (not only for links)
• Fixed Position‘s Support (to support a fixed element in certain position)
• Background-attachment (to support the background of any fixed element)

And also it is necessary to emphasize the improvement of the support to the <objet> tag (to show multimedia – videos elements).

More information: Details on our CSS changes for IE7