Fullscreen request not working in Android Stock browser

I have my own HTML5 video player and my problem is that I cannot enter full screen mode in Android Stock Browser (tested on Huawei ascend mate, htc desire, galaxy s2 / s3). It works in other browsers (Chrome, Safari, etc.). I opened Youtube with android browser and no problem with this option. I noticed that you don't have a turntable, but another standard player.

window.onload=function(){
var video = document.getElementById("video-player");

function enterFullscreen() {
    if (!document.fullscreenElement && !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement) {          
        if (video.requestFullscreen) {
            video.requestFullscreen();
        } else if (video.msRequestFullscreen) {
            video.msRequestFullscreen();                
        } else if (video.mozRequestFullScreen) {
            video.mozRequestFullScreen();               
        } else if (video.webkitRequestFullscreen) {
            video.webkitRequestFullscreen();                
        }           
    } else {
        if (document.exitFullscreen) {
            document.exitFullscreen();
        } else if (document.msExitFullscreen) {
            document.msExitFullscreen();
        } else if (document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
        } else if (document.webkitExitFullscreen) {
            document.webkitExitFullscreen();
        }
    }
    return false;
}


var rF = document.getElementById("fullscreen-btn");
rF.addEventListener("click", function() {
    enterFullscreen();
});
};

<video id="video-player" width="640" height="390" src="video.mp4" controls></video>
<button id="fullscreen-btn" type="button">Fullcsreen</button>