Background/element goes black when entering Fullscreen with HTML5

Question

I\'m using the following script to make my web app go fullscreen...

function enterFullscreen(){
    var element = document.getElementById(\'container\');
            


        

Answer 1

None of the other answers is working for me (Chrome 70 or FF 63)

Adding this to the CSS file does work

::backdrop
{
    background-color: white;
}