<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var w=window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth; var h=window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight; x=document.getElementById("demo"); x.innerHTML=" Browser internal window width: " + w + " , height: " + h + " . " </ Script > </ body > </ html >
Open with a browser to view the browser viewport size