Spy der Mann writes "The Web Standards project have released the Acid3 test. Acid3 goes way beyond CSS, and includes one or more of the following: DOM2, ECMAScript, HTML4, HTTP, media queries, selectors, XHTML 1.0, CSS2, CSS2.1, CSS3, data: URIs, and SVG, to name a few.
Further information can be found in the press release. And for the curious, here's the acid3 test page."
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