If you ever wondered what your browser height and width is, don’t waste your time anymore but check it out with JavaScript. Actually there’s a difference, normally, between document height and the browser height for instance. The document can be higher than the browser, and that occurs when there’s a vertical scroll on the page.
In fact it’s quite easy to get the browser height and width (what we see as the white part of a blank page).
Simply check that out by dumping:
window.innerWidth & window.innerHeight