[Webkit-unassigned] [Bug 203288] New: MediaQueryList should extend EventTarget

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203288

            Bug ID: 203288
           Summary: MediaQueryList should extend EventTarget
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shvaikalesh at gmail.com

Initially, CSSOM View Module specification (https://www.w3.org/TR/2011/WD-cssom-view-20110804/#mediaquerylist) had a custom callback mechanism with addListener() and removeListener(), and the callback was invoked with the associated media query list as argument.
Now the normal event mechanism is used instead: https://www.w3.org/TR/cssom-view-1/#mediaquerylist.
For backwards compatibility, the addListener() and removeListener() methods are basically aliases for addEventListener() and removeEventListener(), respectively, and the "change" event masquerades as a MediaQueryList.

Other browsers have already shipped the change.
To do list for Safari:
1. Implement MediaQueryListEvent interface.
2. Make MediaQueryList subclass of EventTarget and emit MediaQueryListEvent.
3. Implement MediaQueryList::onchange attribute.

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