Added ref tests for the dir attribute.

[NebuPookins]

http://www.w3.org/html/wg/drafts/html/CR/dom.html#the-dir-attribute

Reftest that exercises many parts of the dir attribute spec.

In particular, Chromium passes and Opera fails the test "If the element is an input element whose type attribute is in the Text, and the dir attribute is in the auto state, if the element's value contains a character of bidirectional character type AL and there is no character of bidirectional character type L anywhere before it in the element's value, then the directionality of the element is 'rtl'".

Both Chromium and Opera fail many tests, including "If the attribute is a directionality-capable attribute and the element's dir attribute is in the auto state, and the first character (in logical order) of the attribute's value that is of bidirectional character type L, AL, or R, is of bidirectional character type AL or R, the directionality of the attribute is 'rtl'."

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/646

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[NebuPookins]

Some of the tests involve the rendering of SELECT dropdown boxes and the TITLE attribute (aka mouseover tooltips). Should the files be renamed to have "-manual.html" as a suffix?

[deniak]

@NebuPookins can you please address @Ms2ger's issue in critic?

[sideshowbarker]

@NebuPookins this PR is waiting for responses from you to review comments

[sideshowbarker]

This PR is still waiting review at https://critic.hoppipolla.co.uk/cd553dcc?review=646

[rniwa]

I think we already have substantial test coverage for dir attribute in https://github.com/w3c/web-platform-tests/commits/master/html/dom/elements/global-attributes

Closing this PR issue since even if we didn't, we would have to split this test into smaller pieces to fit into 600px by 600px, and the submitter hasn't replied since July 2014.