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You can use meta tags to tell search engines crawlers not to index a particular webpage or site. To do that you need to place one of the meta tags on your webpage.
To play a youtube video in the loop if it is embedded using HTML Iframe, you can pass loop=1 as a parameter in the src attribute.
To play YouTube video embedded using Iframe in HTML you need to pass autoplay=1 and mute=1 in the src after video URL.
To play video automatically in HTML you can use autoplay attribute to video tag
