Implement GlobalEventHandlers.onsubmit

[jdm]

From the jQuery test suite initialization:

    // Support: IE<9 (lack submit/change bubble), Firefox 17+ (lack focusin event)
    // Beware of CSP restrictions (https://developer.mozilla.org/en/Security/CSP), test/csp.php
    for ( i in { submit: true, change: true, focusin: true }) {
        div.setAttribute( eventName = "on" + i, "t" );

        support[ i + "Bubbles" ] = eventName in window || div.attributes[ eventName ].expando === false;
    }

ERROR:js::rust: Error at http://localhost:8888/test/data/jquery-1.9.1.js:1446: TypeError: div.attributes[eventName] is undefined

Needed for #5395.

[jdm]

This is as simple as adding the attributes to components/script/dom/webidls/EventHandler.webidl and adding them to the global_event_handlers macro in components/script/dom/macros.rs.

[Ms2ger]

If it's just in the test suite, can we get that crap removed?

[jdm]

Well, I'm pretty sure that's the jQuery source that's being loaded and throwing that exception, since it's in jQuery-1.9.1.js.

[pikzen]

Could I get this assigned ?

I went ahead and applied the suggested fixes. I've got a working implementation, as in "this particular error does not happen anymore". The test suite is still broken though, as other errors happen later.

[jdm]

Yep, we'll file more issues blocking #5395 for subsequent problems discovered.

[Ms2ger]

focusin is not in the spec. I filed #5454 for the real issue here.

[jdm]

focusin is defined at https://dvcs.w3.org/hg/dom3events/raw-file/tip/html/DOM3-Events.html#event-type-focusin.

[jdm]

Oh, but the event handler isn't part of GlobalEventHandlers in https://html.spec.whatwg.org/#globaleventhandlers. I see.