Fullscreen API requestFullscreen()
Example
Show a <video> element in fullscreen mode:
  /* 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 property yet */
function openFullscreen() {
  
  if (elem.requestFullscreen) {
    elem.requestFullscreen();
  } else if (elem.webkitRequestFullscreen) 
  { /* Safari */
    
  elem.webkitRequestFullscreen();
  } else if (elem.msRequestFullscreen) 
  { /* IE11 */
    elem.msRequestFullscreen();
  }
  }
Try it Yourself »
More "Try it Yourself" examples below.
Description
The requestFullscreen() method opens an element in fullscreen mode.
Tip: Use the exitFullscreen() method to cancel fullscreen mode.
Browser Support
The numbers in the table specify the first browser version that fully supports the method. Note: Some browsers require a specific prefix (see parentheses):
| Method | |||||
|---|---|---|---|---|---|
| requestFullscreen() | 71.0 15.0 (webkit)  | 
    79.0 11.0 (ms)  | 
    64.0 9.0 (moz)  | 
    6.0 (webkit) | 58.0 15.0 (webkit)  | 
  
Syntax
 HTMLElementObject.requestFullscreen()
Parameters
| None | 
Technical Details
| Return Value: | No return value | 
|---|
More Examples
To open the HTML 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
  /* 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.webkitRequestFullscreen) 
  { /* Safari */
    elem.webkitRequestFullscreen();
  } 
  else if (elem.msRequestFullscreen) { /* IE11 */
    elem.msRequestFullscreen();
  }
}
/* 
  Close fullscreen */
function closeFullscreen() {
  
  if (document.exitFullscreen) {
    document.exitFullscreen();
  } else if (document.webkitExitFullscreen) 
  { /* Safari */
    document.webkitExitFullscreen();
  } 
  else if (document.msExitFullscreen) { /* IE11 */
    
  document.msExitFullscreen();
  }
}
Try it Yourself »
You can also use CSS to style the page when it is in fullscreen mode:
Example
  /* Safari */
:-webkit-full-screen {
  
  background-color: yellow;
}
/* IE11 syntax */
:-ms-fullscreen {
  
  background-color: yellow;
}
/* Standard syntax */
:fullscreen {
  
  background-color: yellow;
}
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