CSS Differences in Internet Explorer 6, 7 and 8

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One of the most bizarre statistical facts in relation to browser use has to be the virtual widespread numbers that currently exist in the use of Internet Explorer versions 6, 7 and 8. As of this writing, Internet Explorer holds about a 65% market share combined across all their currently used browsers. In the web development community, this number is much lower, showing about a 40% share.

The interesting part of those statistics is that the numbers across IE6, IE7, and IE8 are very close, preventing a single Microsoft browser from dominating browser stats — contrary to what has been the trend in the past. Due to these unfortunate statistics, it is imperative that developers do thorough testing in all currently-used Internet Explorer browsers when working on websites for clients, and on personal projects that target a broader audience.

Thanks to the many available JavaScript libraries, JavaScript testing across different browsers has become as close to perfect as the current situation will allow. But this is not true in CSS development, particularly in relation to the three currently used versions of Internet Explorer.

This article will attempt to provide an exhaustive, easy-to-use reference for developers desiring to know the differences in CSS support for IE6, IE7 and IE8. This reference contains brief descriptions and compatibility for:

  • Any item that is supported by one of the three browser versions, but not the other two
  • Any item that is supported by two of the three browser versions, but not the other one

This article does not discuss:

  • Any item that is not supported by any of the three browser versions
  • Proprietary or vendor-specific CSS

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