How TO - Fullscreen
Learn how to make a fullscreen window with JavaScript.
Fullscreen Window
How to use JavaScript to view an element in fullscreen mode.
Click on the button to open the video in fullscreen mode:
Fullscreen Video
To open an element in fullscreen, we use the element.requestFullscreen() 
method:
Example
<script>
/* Get the element you want displayed in fullscreen mode (a 
  video in this example): */
var elem = document.getElementById("myvideo");
  
/* When the openFullscreen() function is executed, open the video in 
  fullscreen.
Note that we must include prefixes for different browsers, as 
  they don't support the requestFullscreen method yet */
function openFullscreen() {
  if (elem.requestFullscreen) {
    
  elem.requestFullscreen();
  } else if (elem.mozRequestFullScreen) { /* 
  Firefox */
    elem.mozRequestFullScreen();
  } else 
  if (elem.webkitRequestFullscreen) { /* Chrome, Safari and Opera */
    
  elem.webkitRequestFullscreen();
  } else if (elem.msRequestFullscreen) 
  { /* IE/Edge */
    elem.msRequestFullscreen();
  }
  }
</script>
Try it Yourself »
Fullscreen Document
To open the whole page in fullscreen, use the document.documentElement instead of document.getElementById("element"). 
In this example, we also use a close function to close the fullscreen:
Example
<script>
/* Get the documentElement (<html>) to display the page in fullscreen */
  var elem = document.documentElement;
/* View in fullscreen */
function openFullscreen() {
  
  if (elem.requestFullscreen) {
    elem.requestFullscreen();
  
  } else if (elem.mozRequestFullScreen) { /* Firefox */
    
  elem.mozRequestFullScreen();
  } else if (elem.webkitRequestFullscreen) 
  { /* Chrome, Safari and Opera */
    elem.webkitRequestFullscreen();
  } else if (elem.msRequestFullscreen) 
  { /* IE/Edge */
    elem.msRequestFullscreen();
  }
}
/* 
  Close fullscreen */
function closeFullscreen() {
  
  if (document.exitFullscreen) {
    document.exitFullscreen();
  
  } else if (document.mozCancelFullScreen) { /* Firefox */
    
  document.mozCancelFullScreen();
  } else if (document.webkitExitFullscreen) 
  { /* Chrome, Safari and Opera */
    document.webkitExitFullscreen();
  
  } else if (document.msExitFullscreen) { /* IE/Edge */
    
  document.msExitFullscreen();
  }
}
</script>
You can also use CSS to style the page when it is in fullscreen mode:
Example
  /* Chrome, Safari and Opera syntax */
:-webkit-full-screen {
  
  background-color: yellow;
}
/* Firefox syntax */
:-moz-full-screen {
  
  background-color: yellow;
}
/* IE/Edge syntax */
:-ms-fullscreen {
  
  background-color: yellow;
}
/* Standard syntax */
:fullscreen {
  
  background-color: yellow;
}
Try it Yourself »
Related Pages
HTML DOM Reference: The requestFullscreen() method.
HTML DOM Reference: The exitFullscreen() method.
HTML DOM Reference: The documentElement property.

