javascript full screen
//creating a button and linking it to bClicked()
document.onload=()=>{
let b = document.body.createElement("button");
b.textContent = 'Fulscreen Element!';
b.addEventListener('click', btnClicked);
}
function btnClicked(){
document
.getElementByID("%id of the element you want to fullscreen%")
.requestFullscreen();
}
//to exit fullscreen
document.exitFullscreen();