[Bug 25002] New: Event.returnValue

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25002

            Bug ID: 25002
           Summary: Event.returnValue
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=2878

Implemented in WebKit/Blink, documented as an IE extension, although IE11 no
longer supports it.

Usage is ridiculously high:
http://www.chromestatus.com/metrics/feature/timeline/popularity/137

Cost of support is low:
bool legacyReturnValue() const { return !defaultPrevented(); }
void setLegacyReturnValue(bool returnValue) {
setDefaultPrevented(!returnValue); }

Consider spec'ing this?

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