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Editorial Team
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Asked: 2026-06-06T11:52:10+00:00

I’m using some CSS properties that does not support in CSS 2.1. For example,

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I’m using some CSS properties that does not support in CSS 2.1. For example, -moz-border-radius, box-shadow, zoom, filter,…. make me fail with the CSS validation.

So are there any techniques to make the CSS validator to ignore them?

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1 Answer

  1. Editorial Team

    For Microsoft Propreitary attributes , you can keep them in conditional comments this way:

    <!--[if IE 6]>
<style type="text/css">
    /* Use all the non-standard Microsoft Propreitary attributes */
    body {zoom: 1; filter: none;}
</style>
<![endif]-->

    If you are using stuff in stylesheets, then you can do this way:

    <!--[if IE 6]>
<link rel="stylesheet" href="ie6.css" type="text/css" />
<![endif]-->

    This validates perfectly in W3C. Use this code to check:

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title>Untitled Document</title>
        <!--[if IE 6]>
        <style type="text/css">
            /* Use all the non-standard Microsoft Propreitary attributes */
            body {zoom: 1; filter: none;}
        </style>
        <![endif]-->
    </head>

    <body>

    </body>
</html>

    Validate by Direct Input: http://validator.w3.org/#validate_by_input

    For others, you can set an option for Vendor Extentions to just display warnings in the CSS Validator.

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