var frontEnd =
window.open('', 'newwin', 'top=100, left=100, width = 500, height = 500, toolbar=no, scroolbar=no')
var newDoc = frontEnd.document.createElement('div')
newDoc.setAttribute('style', `width: 100%; height: 100%;
background-image: url("
https://ichef.bbci.co.uk/news/640/cpsprodpb/14236/production/_104368428_gettyimages-543560762.jpg");
background-position: center center;;
background-repeat: no-repeat;
background-size: cover;`)
frontEnd.document.body.appendChild(newDoc)
function moveWindow(moveObj) {
function getScreen() {
var maxPossitionX = innerWidth
var randomX = Math.floor(Math.random() * maxPossitionX);
var maxPossitionY = innerHeight
var randomY = Math.floor(Math.random() * maxPossitionY);
moveObj.moveTo(randomX, randomY)
}
setInterval(getScreen, 1000)
}
moveWindow(frontEnd)