https://www.w3schools.com/TAGS/av_met_canplaytype.asp
HTML Audio/Video DOM canPlayType() Method
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https://bugzilla.mozilla.org/show_bug.cgi?id=1208349
1208349 - [EME] canPlayType still broken on Windows N
RESOLVED (chris) in Core - Audio/Video: Playback. Last updated 2015-09-28.
emestillbrokenwindows
https://developer.mozilla.org/de/docs/Web/API/HTMLMediaElement/canPlayType
HTMLMediaElement: Methode canPlayType() - Web-APIs | MDN
Die Methode canPlayType() des HTMLMediaElement gibt an, wie wahrscheinlich es ist, dass der aktuelle Browser Medien eines gegebenen MIME-Typs abspielen kann.
web apishtmlmediaelementmethodemdn