NOTE: This script is obsolete. You should use the far superior CSS3PIE instead.

CSS3 support for Internet Explorer 6, 7, and 8

What is it?

IE-CSS3 is a script to provide Internet Explorer support for some new styles available in the upcoming CSS3 standard.

How it works

If you're viewing this page in Internet Explorer, some of the elements have been rebuilt by the script in Vector Markup Language (VML), an IE-specific vector drawing language. VML supports things that are missing from IE's CSS implementation like rounded corners and blur effects.

How to use it

Just add CSS styles as you normally would, but include one new line:

.box {
  -moz-border-radius: 15px; /* Firefox */
  -webkit-border-radius: 15px; /* Safari and Chrome */
  border-radius: 15px; /* Opera 10.5+, future browsers, and now also Internet Explorer 6+ using IE-CSS3 */

  -moz-box-shadow: 10px 10px 20px #000; /* Firefox */
  -webkit-box-shadow: 10px 10px 20px #000; /* Safari and Chrome */
  box-shadow: 10px 10px 20px #000; /* Opera 10.5+, future browsers and IE6+ using IE-CSS3 */

  behavior: url(; /* This lets IE know to call the script on all elements which get the 'box' class */

Issues and Workarounds

You would expect URLs in behavior: url(...) to be relative to the current directory as they are in a background-image: url(...) style for example, but instead Microsoft decided to ignore standards here and make them relative to the docroot instead. So behavior: url( should work if is in the root directory of the site.

You will probably run into issues with z-index, especially if embedding one IE-CSS3 enabled element inside of another. There are two simple workarounds:

Sometimes an IE-CSS3 element will show up at a slightly different position than the original, untouched element. There could be a few reasons for this:

Styles and their status

Style What works What doesn't work
  • Setting a radius for all four corners
  • Element borders
  • Setting a radius for individual corners separately
  • Blur size
  • Offset
  • Any color other than #000
  • Blur size
  • Offset
  • Color
  • The shadow looks a little bit different than it does in FF/Safari/Chrome
This cat does not approve of square corners.

This is a fork of Remiz Rahnas's original script. Thanks Remiz!

Old IE-CSS3 Better CSS3PIE