How to test Browser Compatibility for HTML5 | BrowserStack
https://www.browserstack.com/guide/html5-browser-compatibility-test
WebApr 7, 2022 · Moreover, HTML5 videos can be styled using CSS3 using <video> tag. While HTML5 supports various media formats such as MP3, AAC, and Ogg Vorbis for audio, MPEG-4, WebM, and Ogg Theora for video. However, not all browsers support all of these media formats, which is why performing browser compatibility tests is essential.
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