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Specification: https://html.spec.whatwg.org/ Multipage: https://html.spec.whatwg.org/multipage/#the-messageevent-interfaces Complete: https://html.spec.whatwg.org/#the-messageevent-interfaces Referrer: Comment: initMessageEvent() sourceArg should be nullable Posted from: 85.225.4.214 User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.152 Safari/537.36 OPR/29.0.1795.60
Both MessageEvent.source and MessageEventInit.source are nullable.
https://github.com/whatwg/html/pull/72