This is not true, all of the things you mentioned are possible in modern browsers and are being standardized. However some of them require permission from the u

This is not true, all of the things you mentioned are possible in modern browsers and are being standardized. However some of them require permission from the user. (1) Full screen: https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_API https://developer.mozilla.org/en-US/docs/Web/API/Fullscreen_... (2) Camera + Microphone: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices https://developer.mozilla.org/en-US/docs/Web/API/MediaDevice...