FamilyHub on regfrigerator

I try to use Tizen 4.o browsser (installed on my fridge) to run my javascript program and it works properly. But there’s no manuals (or I can’t find it) so I don’t know how to move the browser in full screen modwe for my application (form inside of my JS application).l When I try to check what browser it is, my procedure tell me CHROME, but this procedure

    if (document.documentElement.requestFullscreen) {
        document.documentElement.requestFullscreen();
    } else if (document.body.requestFullscreen) {
        document.body.requestFullscreen();
    } else if (document.documentElement.mozRequestFullScreen) {
        document.documentElement.mozRequestFullScreen();
    } else if (document.documentElement.webkitRequestFullscreen) {
        document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
    } else if (document.body.webkitRequestFullScreen) {
        document.body.webkitRequestFullScreen();
    } else if(typeof window.ActiveXObject != "undefined"){
        for Internet Explorer
        var wscript = new ActiveXObject("WScript.Shell");
        if(wscript != null){
            wscript.SendKeys("{F11}");
        }
    }

do not work. Any suggestions please.