http://www.webstandards.org

''From the website...''

:The World Wide Web Consortium (W3C) has established standards for interpreting Web-based content.

:By releasing browsers which do not uniformly support those standards, browser makers are injuring Web developers, businesses and users alike.

:Lack of uniform support for W3C standards makes using and developing Web-based technologies unnecessarily difficult and expensive.

:We recognize the necessity of innovation in a fast-paced market. However, basic support of existing W3C standards has been sacrificed in the name of such innovation, needlessly fragmenting the Web and helping no one.

:Our goal is to support these core standards and encourage browser makers to do the same, thereby ensuring simple, affordable access to Web technologies for all.

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They have this deadly CascadingStyleSheets test called the BoxAcidTest.