I have a Fire HD 10 tablet that I recently purchased. I want to run a web app on it in full-screen mode (this web app, if you're curious), so that neither the system UI (notifications bar and navigation bar) or the browser UI (address bar) are visible. What Android app can I use for this?
Since I control the web app in this case, I was able to add a button that calls
document.body.requestFullscreen, which works in Chromium, Firefox, and the stock browser (Silk Browser).
It would still be good to get an answer for the case where you can't control the web app.