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Having problem with "rootMargin" option in Codepen - Editor View
=> Change view to Full page!
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Video loads 300px (rootMargin) before coming into viewport
and starts playing when 80% visible (threshold)
I left the audio ON for testing, to be shure if the video is paused or still playing when out of ViewPort - add "muted" attribute to video tag to silent it!
On LIVE SITES if video is not muted, the video player will not start until you click somewhere and will throw an error -> Uncaught (in promise) DOMException
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Video no.1
Video no.2
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Some other stuff belove...
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