I'm trying to make a web application that is 100% of the screen width and 100% of the screen height, with an aspect ratio of 16: 9. It would be great if I could view this website in full screen on my tablet, but unfortunately , the on-screen toolbar takes up a lot of space, which makes my site not displayed either at full height or in full width:

Now I know that recently, you can hide the scroll bar by scrolling down the page ( source ). However, since my web application is 100% higher, I cannot hide the toolbar this way.
I was wondering if anyone has any other idea on how I can hide the toolbar. The CSS-only method is preferred (or perhaps some HTML meta tag), but I will also agree to the technique using JavaScript.
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