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If you use a style sheet to control layout, you need to make sure that the page is
still legible and meaningful if you view the page without your style sheet.
You can test how your page looks without the style sheet in a number of ways:
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Disable the style sheet in your browser and look at your pages. This will show
you what the site looks like and whether it works without style sheets
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Test the website with different browsers to determine if the site works on browsers
with different style sheet capabilities. For example, test on the Macintosh and
PC platforms with different browsers like Internet Explorer, Opera, Netscape and
a text-only browser like Lynx
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Test the website on older browsers. Older browsers may not support style sheets
so testing the web site with an older browser will show if the information and
functionality is accessible to older browsers
Test style sheets with the W3C style sheet validator. This software tool can be used
to validate CSS 1 and CSS 2.
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More information
An overview of the accessibility guidelines
Ensure that pages featuring new technologies transform gracefully
Organise pages so they work without style sheets
Update equivalents for dynamic content when the dynamic content changes
Ensure that pages are usable when scripts, applets, or other programmatic objects are turned off
Ensure that event handlers are input device-independent
Ensure that dynamic content is accessible
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