[html-tests] Test that the error event can be canceled during loadstart (#679)

The first of these tests fails in Blink.

The spec probably doesn't require the tested beahvior, but it should:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=24710

View on GitHub: https://github.com/w3c/web-platform-tests/pull/679

Received on Saturday, 22 February 2014 18:19:28 UTC