Click the screen with your finger to simulate F11 and enter the full screen

        window.onclick = document.onclick = function (e) {
    
            fullScreen();
        }
        function fullScreen() {
    
            var el = document.documentElement;
            var rfs = el.requestFullScreen || el.webkitRequestFullScreen ||
              el.mozRequestFullScreen || el.msRequestFullScreen;
            if (typeof rfs != "undefined" && rfs) {
    
                rfs.call(el);
            } else if (typeof window.ActiveXObject != "undefined") {
    
                //for IE, This is actually a simulation of pressing the keyboard F11, Make the browser full screen 
                var wscript = new ActiveXObject("WScript.Shell");
                if (wscript != null) {
    
                    wscript.SendKeys("{F11}");
                }
            }
        }

html You don't need to write anything , Use only this paragraph js That's all right.