jquery/src/dimensions.js

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// Create innerHeight, innerWidth, outerHeight and outerWidth methods
jQuery.each([ "Height", "Width" ], function(i, name){
var tl = i ? "Left" : "Top", // top or left
br = i ? "Right" : "Bottom"; // bottom or right
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// innerHeight and innerWidth
jQuery.fn["inner" + name] = function(){
return this[ name.toLowerCase() ]() +
num(this, "padding" + tl) +
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num(this, "padding" + br);
};
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// outerHeight and outerWidth
jQuery.fn["outer" + name] = function(margin) {
return this["inner" + name]() +
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num(this, "border" + tl + "Width") +
num(this, "border" + br + "Width") +
(margin ?
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num(this, "margin" + tl) + num(this, "margin" + br) : 0);
};
var type = name.toLowerCase();
jQuery.fn[ type ] = function( size ) {
// Get window width or height
return this[0] == window ?
// Everyone else use document.documentElement or document.body depending on Quirks vs Standards mode
document.compatMode == "CSS1Compat" && document.documentElement[ "client" + name ] ||
document.body[ "client" + name ] :
// Get document width or height
this[0] == document ?
// Either scroll[Width/Height] or offset[Width/Height], whichever is greater
Math.max(
document.documentElement["client" + name],
document.body["scroll" + name], document.documentElement["scroll" + name],
document.body["offset" + name], document.documentElement["offset" + name]
) :
// Get or set width or height on the element
size === undefined ?
// Get width or height on the element
(this.length ? jQuery.css( this[0], type ) : null) :
// Set the width or height on the element (default to pixels if value is unitless)
this.css( type, typeof size === "string" ? size : size + "px" );
};
});