Poor interoperability between browsers is one of the main frustrations faced when trying to develop for the web platform. Solving this is essential for safeguarding the future of the open web, and requires a comprehensive web platform testsuite that is run by all browser vendors. The challenge of creating this test suite is being coordinated by the W3C under the "Test The Web Forward" banner. In this talk, I will present the current state of the test suite, how Mozilla are using these tests in their automated testing infrastructure, and explain how to get involved with improving the web by contributing to the testing effort.