The <source> element allows you to specify alternative video files which the browser may choose from. The browser will use the first recognized format.
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Add muted after autoplay to let your video start playing automatically (but muted)
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Add mute=1 after autoplay=1 to let your video start playing automatically (but muted)
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XHTML was developed to make HTML more extensible and flexible to work with other data formats (such as XML)
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XML is a markup language where all documents must be marked up correctly (be "well-formed")
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