All the features that are defined in @w3c specifications to be shipped in browsers are accompanied by a test suite, to help assess how well and how broadly they are implemented by actual browsers.
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The test cases that compose these test suites are Web pages that trigger the said feature in isolation and which can report whether the browser running or displaying the page supports the features correctly.
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The results of running these test suites are updated on a regular basis on the Web Platform Tests Dashboard wpt.fyi/

Apr 17, 2018 · 4:41 PM UTC

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All these test suites are managed in a central github repository github.com/w3c/web-platform-… - by far the most active and popular repo for the @w3c organization.
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⚠️PSA: If you use or contribute to these test suites, please note that there is ongoing work toward migrating this repository (and other associated repositories) to a new github organization lists.w3.org/Archives/Public… github.com/web-platform-test…
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If you have specific requirements with regard to this transition, please join the thread on the mailing list lists.w3.org/Archives/Public…
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More details on this transition by @plhw3org on the @w3c blog w3.org/blog/2018/04/a-short-…
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