speed/validity selectors test for frameworks.
Every framework runs in its own iFrame, thus no conflicts can happen. Tests are run selector by selector, with an interval to prevent the browser from freezing.
The WebKit version of this test includes a number of modifications. Specifically
The tests are run 250 times instead of once to show speed differences more accurately
querySelectorAll is added as a supported “library”
CSS selectors that not all implementations support have been removed to avoid distorting timing results. These will be added back in as new selectors are implemented.