javascript detect fullscreen mode code example

Example: fullscreen mode javascript

//creating a button and linking it to bClicked()
document.onload=function(){
  documentbody.innerHTML += "<button onclick=\"bClicked()\"></button>"
}

function bClicked(){
  //yourID = the element that you want to fullscreen 
  document.getElementByID("yourID").requestFullscreen();
}

//to exit fullscreen
document.exitFullscreen();