23489 2013-10-14 14:41:53 +0000 OnBeforeUnloadEventHandlerNonNull should have a nullable return value. 2013-11-13 22:45:45 +0000 1 1 1 Unclassified WHATWG HTML unspecified PC All RESOLVED FIXED P2 normal Unsorted 19713 1 peterv ian ian mike contributor oldest_to_newest 94656 0 peterv 2013-10-14 14:41:53 +0000 The prose about event processing for beforeunload says 'If the return value is null, then cancel the event.' However, the WebIDL definition for OnBeforeUnloadEventHandlerNonNull is |callback OnBeforeUnloadEventHandlerNonNull = DOMString (Event event);| which has a non-nullable DOMString return value. It should be |callback OnBeforeUnloadEventHandlerNonNull = DOMString? (Event event);|. 96265 1 contributor 2013-11-13 22:45:45 +0000 Checked in as WHATWG revision r8282. Check-in comment: OnBeforeUnloadEventHandler is supposed to allow null return values (and some markup error fixes, oops) http://html5.org/tools/web-apps-tracker?from=8281&to=8282