[dom][html] Update dom/interfaces.html to current spec (#359)

This is based on top of pull request #358, and will almost certainly not work without that, because it uses IDL features only supported by webidl2.js.  I don't know if I should make such requests separate or just include that one in this.

This will cause the file to stop working until [testharness.js pull request #43](https://github.com/w3c/testharness.js/pull/43) is accepted.  So, don't accept this one before you accept that one.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/359

Received on Monday, 30 September 2013 17:09:36 UTC