https://www.macrumors.com/2014/06/03/os-x-yosemite-netflix/
OS X Yosemite Brings HTML5 Video Support for Netflix - MacRumors
During yesterday's WWDC keynote, Apple announced several improvements to Safari in OS X Yosemite, including HTML5 video support for Netflix....
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https://daringfireball.net/linked/2010/03/17/html5-ie9
Daring Fireball: Microsoft Promises HTML5 Video Support in IE9
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https://caniuse.com/video
Video element | Can I use... Support tables for HTML5, CSS3, etc
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
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