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The W3C Markup Validation Service

The W3C Markup Validation Service: "his validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available."

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Internet Explorer 9 Platform Preview Released - CSS3 . Info

Internet Explorer 9 Platform Preview Released - CSS3 . Info : "Microsoft today announced further details of their forthcoming Internet Explorer 9 browser, along with the first platform preview for developers, at their MIX Conference 2010. Amongst the announcements comes increased support for CSS3, with support promised for CSS3 Selectors, Namespaces, Colors, Values, Backgrounds & Borders and Fonts, along with increased support for HTML5 and improvements in JavaScript performance. The platform preview, downloadable from the Internet Explorer website, comes with a number of demonstrations including those for CSS3 border-radius and selectors. The preview also scores an impressive 578/578 on our CSS3 Selectors Test and an improved 55/100 on the Acid 3 test, with further improvements promised before the final release. You can read more on the Internet Explorer blog, or download the platform preview here."