Testpages to check HTML5 audio/video
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Useful to check if HTML5 audio/video works on Vivaldi and other Chromium related browsers.
https://www.quirksmode.org/html5/tests/video.html
https://tools.woolyss.com/html5-audio-video-tester/
https://demo.castlabs.com/
http://hpr.dogphilosophy.net/test/If missing useful test pages here please contact me by chat.