style, origName ) );

// gets hook for the prefixed version
// followed by the unprefixed version
hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];

// If a hook was provided get the computed value from there
if ( hooks && "get" in hooks ) {
val = hooks.get( elem, true, extra );
}

// Otherwise, if a way to get the computed value exists, use that
if ( val === undefined ) {
val = curCSS( elem, name, styles );
}

//convert "normal" to computed value
if ( val === "normal" && name in cssNormalTransform ) {
val = cssNormalTransform[ name ];
}

// Return, converting to number if forced or a qualifier was provided and val looks numeric
if ( extra === "" || extra ) {
num = parseFloat( val );
return extra === true || jQuery.isNumeric( num ) ? num || 0 : val;
}
return val;
},

// A method for quickly swapping in/out CSS properties to get correct calculations
swap: function( elem, options, callback, args ) {
var ret, name,
old = {};

// Remember the old values, and insert the new ones
for ( name in options ) {
old[ name ] = elem.style[ name ];
elem.style[ name ] = options[ name ];
}

ret = callback.apply( elem, args || [] );

// Revert the old values
for ( name in options ) {
elem.style[ name ] = old[ name ];
}

return ret;
}
});

// NOTE: we've included the "window" in window.getComputedStyle
// because jsdom on node.js will break without it.
if ( window.getComputedStyle ) {
getStyles = function( elem ) {
return window.getComputedStyle( elem, null );
};

curCSS = function( elem, name, _computed ) {
var width, minWidth, maxWidth,
computed = _computed || getStyles( elem ),

// getPropertyValue is only needed for .css('filter') in IE9, see #12537
ret = computed ? computed.getPropertyValue( name ) || computed[ name ] : undefined,
style = elem.style;

if ( computed ) {

if ( ret === "" && !jQuery.contains( elem.ownerDocument, elem ) ) {
ret = jQuery.style( elem, name );
}

// A tribute to the "awesome hack by Dean Edwards"
// Chrome < 17 and Safari 5.0 uses "computed value" instead of "used value" for margin-right
// Safari 5.1.7 (at least) returns percentage for a larger set of values, but width seems to be reliably pixels
// this is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values
if ( rnumnonpx.test( ret ) && rmargin.test( name ) ) {

// Remember the original values
width = style.width;
minWidth = style.minWidth;
maxWidth = style.maxWidth;

// Put in the new values to get a computed value out
style.minWidth = style.maxWidth = style.width = ret;
ret = computed.width;

// Revert the changed values
style.width = width;
style.minWidth = minWidth;
style.maxWidth = maxWidth;
}
}

return ret;
};
} else if ( document.documentElement.currentStyle ) {
getStyles = function( elem ) {
return elem.currentStyle;
};

curCSS = function( elem, name, _computed ) {
var left, rs, rsLeft,
computed = _computed || getStyles( elem ),
ret = computed ? computed[ name ] : undefined,
style = elem.style;

// Avoid setting ret to empty string here
// so we don't default to auto
if ( ret == null && style && style[ name ] ) {
ret = style[ name ];
}

// From the awesome hack by Dean Edwards
// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291

// If we're not dealing with a regular pixel number
// but a number that has a weird ending, we need to convert it to pixels
// but not position css attributes, as those are proportional to the parent element instead
// and we can't measure the parent instead because it might trigger a "stacking dolls" problem
if ( rnumnonpx.test( ret ) && !rposition.test( name ) ) {

// Remember the original values
left = style.left;
rs = elem.runtimeStyle;
rsLeft = rs && rs.left;

// Put in the new values to get a computed value out
if ( rsLeft ) {
rs.left = elem.currentStyle.left;
}
style.left = name === "fontSize" ? "1em" : ret;
ret = style.pixelLeft + "px";

// Revert the changed values
style.left = left;
if ( rsLeft ) {
rs.left = rsLeft;
}
}

return ret === "" ? "auto" : ret;
};
}

function setPositiveNumber( elem, value, subtract ) {
var matches = rnumsplit.exec( value );
return matches ?
// Guard against undefined "subtract", e.g., when used as in cssHooks
Math.max( 0, matches[ 1 ] - ( subtract || 0 ) ) + ( matches[ 2 ] || "px" ) :
value;
}

function augmentWidthOrHeight( elem, name, extra, isBorderBox, styles ) {
var i = extra === ( isBorderBox ? "border" : "content" ) ?
// If we already have the right measurement, avoid augmentation
4 :
// Otherwise initialize for horizontal or vertical properties
name === "width" ? 1 : 0,

val = 0;

for ( ; i < 4; i += 2 ) {
// both box models exclude margin, so add it if we want it
if ( extra === "margin" ) {
val += jQuery.css( elem, extra + cssExpand[ i ], true, styles );
}

if ( isBorderBox ) {
// border-box includes padding, so remove it if we want content
if ( extra === "content" ) {
val -= jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );
}

// at this point, extra isn't border nor margin, so remove border
if ( extra !== "margin" ) {
val -= jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
}
} else {
// at this point, extra isn't content, so add padding
val += jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );

// at this point, extra isn't content nor padding, so add border
if ( extra !== "padding" ) {
val += jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
}
}
}

return val;
}

function getWidthOrHeight( elem, name, extra ) {

// Start with offset property, which is equivalent to the border-box value
var valueIsBorderBox = true,
val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
styles = getStyles( elem ),
isBorderBox = jQuery.support.boxSizing && jQuery.css( elem, "boxSizing", false, styles ) === "border-box";