How do I get the size of the browser window using Prototype.js?

Question

How do I get the size of the browser window using Prototype.js version 1.6.0.3?

Answer 1

According to the Prototype API documentation:

var viewport = document.viewport.getDimensions(); // Gets the viewport as an object literal
var width = viewport.width; // Usable window width
var height = viewport.height; // Usable window height

Answer 2

And the same idea but more compact:

var WindowSize = Class.create({
    width: window.innerWidth || (window.document.documentElement.clientWidth || window.document.body.clientWidth),
    height: window.innerHeight || (window.document.documentElement.clientHeight || window.document.body.clientHeight)
});