Some features require Secure Context. Browsers just don't enable those features in a context that isn't secure (HTTP is only considered "secure" on the loopback network to your own machine). If it's a Javascript API it returns an error, if it's an HTML or HTTP feature it doesn't work. "Here's a nickel kid, get yourself a secure context".

Both Chrome / Chromium and Firefox have explicitly set policy that new features (as opposed to tidier ways to do things that already exist like DOM improvements) will require Secure Context, and there's already a weak assumption that even some tidying up will go into secure context when the rationale for not doing so is shaky (e.g. some of the web crypto features that needn't technically require Secure Context do anyway).