This site is mobile accessible. Press the "Tap Here" button to use a different font-size.

Tap Here!

Smartphone icons created by Freepik - Flaticon

JS Window

// display the height and width of the content area of the browser window
document.getElementById("demo").innerHTML =
"Browser inner window width: " + window.innerWidth + "px
" +
"Browser inner window height: " + window.innerHeight + "px";

The browser window (the browser viewport) is NOT including toolbars and scrollbars.