EME: onwaitingforkey, onkeystatuseschange, & onmessage event handler attributes

Category: Multimedia
Type: New or changed feature
Status: Enabled by default (Chrome 55)
Intent stage: None

Summary

Add the following EventHandler attributes for existing EME events: * HTMLMediaElement: * onwaitingforkey * (onencrypted is already implemented) * MediaKeySession: * onkeystatuseschange * onmessage

Standards & signals

Specification: https://w3c.github.io/encrypted-media/#dom-mediakeysession-onkeystatuseschange
Firefox: In development
Safari: No signal
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=635693

Docs: Spec issue: https://github.com/w3c/encrypted-media/issues/176

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