Answer
Preload=”none”: This suggests that it isn’t necessary to preload the video or any metadata. We use this if Its less likely the user will pay the video or if few want to minimize server traffic.
Preload=”metadata”: this is the same as none except to hint that fetching video metadata only, such as the dimensions, duration, and so on, is ok.
Preload=”auto”: This hints to the user agent that server traffic is not concern so it may preload some or all of the video.
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