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From: FAQ server on 24 Apr 2008 01:00
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FAQ Topic - How do I find the size of the window/browser
canvas area?
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While it is often asked about window size, what is more relevant is
the "canvas area" of the browser.

Where supported in NN: (>NN4.0)

var winWidth = window.innerWidth;
var winHeight = window.innerHeight;

Where supported in IE: (>IE4.0)

var winWidth = document.body.clientWidth;
var winHeight = document.body.clientHeight;

Where supported in modern browsers:

var winWidth = document.documentElement.clientWidth;
var winHeight = document.documentElement.clientHeight;

Where supported in DOM compliant browsers:

var winWidth, winHeight, d=document;
if (typeof window.innerWidth!='undefined') {
winWidth = window.innerWidth;
winHeight = window.innerHeight;
} else {
if (d.documentElement &&
typeof d.documentElement.clientWidth!='undefined' &&
d.documentElement.clientWidth!==0) {
winWidth = d.documentElement.clientWidth;
winHeight = d.documentElement.clientHeight;
} else {
if (d.body &&
typeof d.body.clientWidth!='undefined') {
winWidth = d.body.clientWidth;
winHeight = d.body.clientHeight;
}
}
}

Note: The dimensions can not be determined accurately until after the
document has finished loading.

http://msdn2.microsoft.com/en-us/library/ms533566.aspx

http://docs.sun.com/source/816-6408-10/window.htm#1202446

http://msdn2.microsoft.com/en-us/library/ms533024.aspx


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