Although one might argue that there's something seriously wrong with your website already if it doesn't work without video playing in the background. According

Although one might argue that there's something seriously wrong with your website already if it doesn't work without video playing in the background. According to the article, blacklisting (or lack of whitelisting) is also easy to detect by handling the Promise rejection, which means you can easily provide a static fallback for video that's used purely decoratively.