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;
}

Answer 2

The default background color of the browser's full-screen "visual environment" is black. Your content actually is there, but it's currently black text on black background, so you can't see it (try highlighting or pressing Ctrl+A to see for yourself).

If you want to make the background a different color, you must specify a CSS rule to set the background-color property to something other than the default. So, in your case:

#container:fullscreen {
    background-color: rgba(255,255,255,0);
}
#container:-webkit-full-screen {
    background-color: rgba(255,255,255,0);
}
#container:-moz-full-screen {
    background-color: rgba(255,255,255,0);
}

should do the trick. (Make sure you use the appropriate vendor version(s) -- :-webkit-full-screen and :-moz-full-screen -- until the spec finalizes; see MDN for more information.)

In fact, maybe just

*:fullscreen, *:-webkit-full-screen, *:-moz-full-screen {
    background-color: rgba(255,255,255,0);
}

EDIT by @DevilishDB: used rgba for a transparent BG and added the * selector to make the previous thing work

Answer 3

I don't know the exact answer to your question, but this information might help:

I had a similar black background problem with enterFullscreen(document.body);. The background color became normal after I changed the line to enterFullscreen(document.documentElement);. The css I used is body{background-color: #D7D7D7; margin: 0px;}.

Answer 4

I spent hours to find a trick for this issue.

I ended by doing that :

• Fixing a white color to backdrop
• And using z-index, to push it down

Then :

• Fixing a white color to the html page content
• And using z-index, to push it up (above backdrop)

It works for me on Firefox and Chrome

::backdrop {
    z-index:0;  
    background-color: white !important;
}

html, *:fullscreen, *:-webkit-full-screen, *:-moz-full-screen {
    background-color: white !important;
    z-index:1;
}

Answer 5

Don't know why, but it seem that the background of the body element is not displayed in fullscreen or become transparent...

I fixed this by setting a background color to the html element, and it work just fine:

html {
    background-color: #ffffff;
    /* Or any color / image you want */
}

Answer 6

the main solution didn't work to me :-( I found another solution, but yes, in the css:

:-webkit-full-screen, :fullscreen, :-ms-fullscreen, :-moz-full-screen {
position: fixed;
width: 100%;
height: 100%;
top: 0; 
background: none;}

I understand this is for the position of my elements, but I no sure. Hope help to somebody. Bye and thanks.