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window.innerHeight Property Javascript DOM

The innerHeight, innerWidth, outerHeight and outerWidth properties will return numeric values that represent the browser and document window. The outer dimensions represent the actual browser software window, while the inner dimensions represent the document window nested inside the browser window.

SYNTAX window.innerHeight

In this example we will access the browser window dimensions as well as the document window dimensions. Repeatedly resize your browser window and press the button to see numbers change.

<!DOCTYPE html>
<script type="text/javascript">
function getWindowInnerSize(){
    var h = window.innerHeight;
    var w = window.innerWidth;
    alert("Inner is "+h+" pixels in height and "+w+" pixels in width");
function getWindowOuterSize(){
    var h = window.outerHeight;
    var w = window.outerWidth;
    alert("Outer is "+h+" pixels in height and "+w+" pixels in width");
<button onclick="getWindowInnerSize()">Get Window Inner Size</button>
<button onclick="getWindowOuterSize()">Get Window Outer Size</button>

This article at WOW has a good visual representation of getting both inner and outer dimensions of a browser window.
Javascript get window dimensions browser width height

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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at