Even test on details element
Remove old test pages
Reworked and new test pages
Test the steps for pausing a media element when removing from a document
Combine all canPlayType tests into a single test framework

There is much more of canPlayType to be tested in later commits.
Add the missing types and codecs used in spec examples
Add the Opus codec, supported by at least Gecko and Chromium
Test that bogus codecs are not supported

Chrome and Safari fail this assertion.
Add more tests for the window object
Tests for the window's length attribute
test on dirname attribute
ref test for wbr
disabled elements cannot be focused
check focus on descendant of disabled fieldset instead of fieldset itself
use case on disabled a/span
use Ahem font to force the rendering
update spec link
fix ref test and add <meta name="flags" content"ahem>
add tests on setting defaultValue
Change text to make sure the ref test passes only if the Ahem font is loaded
add tests for value flag mode is in default/value mode
fix/update tests' description