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CSS3 Selectors Test
After starting the test-suite it will automatically run a large number of small tests which will determine if your browser is compatible with a large number of CSS selectors. If it is not compatible with a particular selector it is marked as such. You can click on each CSS selector to see the results, including a small example and explanation for each of tests.
Because it is technically not possible to simulate certain user interactions the test is limited to CSS selectors that are not dependent on user interactions. So this test-suite does not include tests for the following selectors: :hover, :active, :focus and :selection.
Update June 30th, 2010: The tests for the :visited and :link selectors have been removed from the test-suite. Almost all browsers have made it impossible to detect style changes between a visited and unvisited links due to privacy concerns. This also affects the ability to test these selectors without user interaction.