Test playing video in a detached document

Many tests don't insert the media element into a document and this
doesn't seem to be a problem. However, all of Opera 20 (Blink), Safari 7
(WebKit), Firefox 30 (Gecko) and IE11 (Trident) fail this test. Only
Opera 12.16 (Presto) passes it, but only after playing to the end; it
seems like timeupdate events aren't being fired correctly.
Add tests for the RadioNodeList interface
Add tests for the HTMLFormControlsCollection interface
Using vendor prefix common infrastructure
renamed files that require manual interactions
cc Made a couple of test cases valid.
additional mathml tests as requested by Denis Ah-Kang
Removed tests using pseudo element

Support for pseudo element has been removed from the spec. These tests
are now obsolete.
Fixed incorrect type in asserts

Asserts were using strings instead of number for checking
styleSheets.length resulting in failing tests.
Adjusted test expectations for getDistributedNodes

Fallback content is now considered to be distributed in the event that
no match was found for the content selector.
Removed a wonky test

The test is failing but Dev Tools shows that event.path is a NodeList...
Michael Cooper, from WAI, confirmed that much of the testing needed for
HTML 5 was done during the PF testing of ARIA.

This is just a pointer to their test suite.
Fixed wrong expectation and added a counterpoint

In this case the shadow content should not be rendered. Also added a
counterpoint case.
Moved/Updated obsolete test for olderShadowRoot

The test was using olderShadowRoot on the Shadow element. This attribute
is now part of the ShadowRoot interface.
Removed obsolete tests for ShadowRoot

These tests were exercising obsolete attributes (applyAuthorStyles,
resetStyleInheritance...)
test when the document is an iframe srcdoc
Removed obsolete test using applyAuthorStyle
Obsolete tests using resetStyleInheritance
Fixed expectations for :nth-child

The original expectations were based on a faulty behavior which has been
fixed. See crbug.com/337573#c9
Merge pull request #742 from KenjiBaheux/fix-incorrect-type-in-assert

Fixed incorrect type in asserts