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Le Validateur unifié du W3C

The Web Platform Tests Project is a W3C-coordinated attempt to build a cross-browser testsuite for the Web-platform stack. However, for mainly historic reasons, the CSS WG testsuite is in a separate repository, csswg-test. Writing tests in a way that allows them to be run in all browsers gives browser projects confidence that they are shipping software that is compatible with other implementations, and that later implementations will be compatible with their implementations. This in turn gives Web authors/developers confidence that they can actually rely on the Web platform to deliver on the promise of working across browsers and devices without needing extra layers of abstraction to paper over the gaps left by specification editors and implementors.

As the Web morphed from a document exchange system to the World's most advanced application delivery platform, the requirements on the underlining technologies and the browsers implementing them changed dramatically. Web applications built today need a robust and interoperable Web that only thorough browser testing can guarantee.

To meet this new challenge, W3C is launching an unprecedented effort to rethink and scale up its testing offering.