diff --git a/src/css.js b/src/css.js
index c1775b7ab..afbf96afb 100644
--- a/src/css.js
+++ b/src/css.js
@@ -13,12 +13,35 @@ var ralpha = /alpha\([^)]*\)/i,
 
 	// order is important!
 	cssExpand = [ "Top", "Right", "Bottom", "Left" ],
+	cssPrefixes = [ "O", "Webkit", "Moz", "ms" ],
 
 	curCSS,
-
 	getComputedStyle,
 	currentStyle;
 
+// return a css property mapped to a potentially vendor prefixed property
+function vendorPropName( style, name ) {
+
+	// shortcut for names that are not vendor prefixed
+	if ( name in style ) {
+		return name;
+	}
+
+	// check for vendor prefixed names
+	var capName = name.charAt(0).toUpperCase() + name.slice(1),
+		origName = name,
+		i = cssPrefixes.length;
+
+	while ( i-- ) {
+		name = cssPrefixes[ i ] + capName;
+		if ( name in style ) {
+			return name;
+		}
+	}
+
+	return origName;
+}
+
 jQuery.fn.css = function( name, value ) {
 	return jQuery.access( this, function( elem, name, value ) {
 		return value !== undefined ?
@@ -72,10 +95,15 @@ jQuery.extend({
 		}
 
 		// Make sure that we're working with the right name
-		var ret, type, origName = jQuery.camelCase( name ),
-			style = elem.style, hooks = jQuery.cssHooks[ origName ];
+		var ret, type, hooks,
+			origName = jQuery.camelCase( name ),
+			style = elem.style;
 
-		name = jQuery.cssProps[ origName ] || origName;
+		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( style, origName ) );
+
+		// gets hook for the prefixed version
+		// followed by the unprefixed version
+		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];
 
 		// Check if we're setting a value
 		if ( value !== undefined ) {
@@ -119,12 +147,15 @@ jQuery.extend({
 	},
 
 	css: function( elem, name, extra ) {
-		var ret, hooks;
+		var ret, hooks,
+			origName = jQuery.camelCase( name );
 
 		// Make sure that we're working with the right name
-		name = jQuery.camelCase( name );
-		hooks = jQuery.cssHooks[ name ];
-		name = jQuery.cssProps[ name ] || name;
+		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( elem.style, origName ) );
+
+		// gets hook for the prefixed version
+		// followed by the unprefixed version
+		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];
 
 		// cssFloat needs a special treatment
 		if ( name === "cssFloat" ) {
@@ -244,9 +275,29 @@ function getWidthOrHeight( elem, name, extra ) {
 	// Start with offset property
 	var val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
 		i = name === "width" ? 1 : 0,
-		len = 4;
+		len = 4,
+		usedOffset = true;
 
-	if ( val > 0 ) {
+	if ( val <= 0 ) {
+		usedOffset = false;
+
+		// Fall back to computed then uncomputed css if necessary
+		val = curCSS( elem, name );
+		if ( val < 0 || val == null ) {
+			val = elem.style[ name ];
+		}
+
+		// Computed unit is not pixels. Stop here and return.
+		if ( rnumnonpx.test(val) ) {
+			return val;
+		}
+
+		// Normalize "", auto, and prepare for extra
+		val = parseFloat( val ) || 0;
+	}
+
+	//if we're using border-box, the css width/height value behaves like the offsetWidth/Height property!
+	if ( usedOffset || ( jQuery.support.boxSizing && jQuery.css( elem, "boxSizing" ) === "border-box" ) ) {
 		if ( extra !== "border" ) {
 			for ( ; i < len; i += 2 ) {
 				if ( !extra ) {
@@ -259,33 +310,17 @@ function getWidthOrHeight( elem, name, extra ) {
 				}
 			}
 		}
-
-		return val + "px";
-	}
-
-	// Fall back to computed then uncomputed css if necessary
-	val = curCSS( elem, name );
-	if ( val < 0 || val == null ) {
-		val = elem.style[ name ];
-	}
-
-	// Computed unit is not pixels. Stop here and return.
-	if ( rnumnonpx.test(val) ) {
-		return val;
-	}
-
-	// Normalize "", auto, and prepare for extra
-	val = parseFloat( val ) || 0;
-
-	// Add padding, border, margin
-	if ( extra ) {
-		for ( ; i < len; i += 2 ) {
-			val += parseFloat( jQuery.css( elem, "padding" + cssExpand[ i ] ) ) || 0;
-			if ( extra !== "padding" ) {
-				val += parseFloat( jQuery.css( elem, "border" + cssExpand[ i ] + "Width" ) ) || 0;
-			}
-			if ( extra === "margin" ) {
-				val += parseFloat( jQuery.css( elem, extra + cssExpand[ i ]) ) || 0;
+	} else {
+		// Add padding, border, margin
+		if ( extra ) {
+			for ( ; i < len; i += 2 ) {
+				val += parseFloat( jQuery.css( elem, "padding" + cssExpand[ i ] ) ) || 0;
+				if ( extra !== "padding" ) {
+					val += parseFloat( jQuery.css( elem, "border" + cssExpand[ i ] + "Width" ) ) || 0;
+				}
+				if ( extra === "margin" ) {
+					val += parseFloat( jQuery.css( elem, extra + cssExpand[ i ] ) ) || 0;
+				}
 			}
 		}
 	}
diff --git a/src/support.js b/src/support.js
index 5a0d1b731..ccf9d4315 100644
--- a/src/support.js
+++ b/src/support.js
@@ -180,6 +180,7 @@ jQuery.support = (function() {
 	jQuery(function() {
 		var container, offsetSupport, marginDiv,
 			conMarginTop = 1,
+			boxSizingPrefixes = [ "", "-moz-", "-webkit-", "" ],
 			body = document.getElementsByTagName("body")[0];
 
 		if ( !body ) {
@@ -250,6 +251,9 @@ jQuery.support = (function() {
 			support.shrinkWrapBlocks = ( div.offsetWidth !== 3 );
 		}
 
+		div.style.cssText = boxSizingPrefixes.join("box-sizing:border-box;") + "width:4px;padding:1px;border:1px;display:block";
+		support.boxSizing = ( div.offsetWidth === 4 );
+
 		offsetSupport = {
 			doesNotIncludeMarginInBodyOffset: ( body.offsetTop !== conMarginTop )
 		};
diff --git a/test/unit/dimensions.js b/test/unit/dimensions.js
index c6b8e835c..ef3d8ca68 100644
--- a/test/unit/dimensions.js
+++ b/test/unit/dimensions.js
@@ -230,12 +230,13 @@ test("outerWidth()", function() {
 	jQuery.removeData($div[0], "olddisplay", true);
 });
 
-test("child of a hidden elem has accurate inner/outer/Width()/Height()  see #9441 #9300", function() {
-	expect(8);
+test("child of a hidden elem (or unconnected node) has accurate inner/outer/Width()/Height()  see #9441 #9300", function() {
+	expect(16);
 
 	// setup html
-	var $divNormal       = jQuery("<div>").css({ width: "100px", height: "100px", border: "10px solid white", padding: "2px", margin: "3px" }),
-		$divChild        = $divNormal.clone(),
+	var $divNormal = jQuery("<div>").css({ width: "100px", height: "100px", border: "10px solid white", padding: "2px", margin: "3px" }),
+		$divChild = $divNormal.clone(),
+		$divUnconnected = $divNormal.clone(),
 		$divHiddenParent = jQuery("<div>").css( "display", "none" ).append( $divChild ).appendTo("body");
 	$divNormal.appendTo("body");
 
@@ -250,6 +251,17 @@ test("child of a hidden elem has accurate inner/outer/Width()/Height()  see #944
 	equal( $divChild.outerHeight(), $divNormal.outerHeight(), "child of a hidden element outerHeight() is wrong see #9441" );
 	equal( $divChild.outerHeight(true), $divNormal.outerHeight( true ), "child of a hidden element outerHeight( true ) is wrong see #9300" );
 
+	// tests that child div of an unconnected div works the same as a normal div
+	equal( $divUnconnected.width(), $divNormal.width(), "unconnected element width() is wrong see #9441" );
+	equal( $divUnconnected.innerWidth(), $divNormal.innerWidth(), "unconnected element innerWidth() is wrong see #9441" );
+	equal( $divUnconnected.outerWidth(), $divNormal.outerWidth(), "unconnected element outerWidth() is wrong see #9441" );
+	equal( $divUnconnected.outerWidth(true), $divNormal.outerWidth( true ), "unconnected element outerWidth( true ) is wrong see #9300" );
+
+	equal( $divUnconnected.height(), $divNormal.height(), "unconnected element height() is wrong see #9441" );
+	equal( $divUnconnected.innerHeight(), $divNormal.innerHeight(), "unconnected element innerHeight() is wrong see #9441" );
+	equal( $divUnconnected.outerHeight(), $divNormal.outerHeight(), "unconnected element outerHeight() is wrong see #9441" );
+	equal( $divUnconnected.outerHeight(true), $divNormal.outerHeight( true ), "unconnected element outerHeight( true ) is wrong see #9300" );
+
 	// teardown html
 	$divHiddenParent.remove();
 	$divNormal.remove();
@@ -278,6 +290,43 @@ test("getting dimensions shouldnt modify runtimeStyle see #9233", function() {
 	$div.remove();
 });
 
+test("box-sizing:border-box child of a hidden elem (or unconnected node) has accurate inner/outer/Width()/Height()  see #10413", function() {
+	expect(16);
+
+	// setup html
+	var $divNormal = jQuery("<div>").css({ boxSizing: "border-box", width: "100px", height: "100px", border: "10px solid white", padding: "2px", margin: "3px" }),
+		$divChild = $divNormal.clone(),
+		$divUnconnected = $divNormal.clone(),
+		$divHiddenParent = jQuery("<div>").css( "display", "none" ).append( $divChild ).appendTo("body");
+	$divNormal.appendTo("body");
+
+	// tests that child div of a hidden div works the same as a normal div
+	equal( $divChild.width(), $divNormal.width(), "child of a hidden element width() is wrong see #10413" );
+	equal( $divChild.innerWidth(), $divNormal.innerWidth(), "child of a hidden element innerWidth() is wrong see #10413" );
+	equal( $divChild.outerWidth(), $divNormal.outerWidth(), "child of a hidden element outerWidth() is wrong see #10413" );
+	equal( $divChild.outerWidth(true), $divNormal.outerWidth( true ), "child of a hidden element outerWidth( true ) is wrong see #10413" );
+
+	equal( $divChild.height(), $divNormal.height(), "child of a hidden element height() is wrong see #10413" );
+	equal( $divChild.innerHeight(), $divNormal.innerHeight(), "child of a hidden element innerHeight() is wrong see #10413" );
+	equal( $divChild.outerHeight(), $divNormal.outerHeight(), "child of a hidden element outerHeight() is wrong see #10413" );
+	equal( $divChild.outerHeight(true), $divNormal.outerHeight( true ), "child of a hidden element outerHeight( true ) is wrong see #10413" );
+
+	// tests that child div of an unconnected div works the same as a normal div
+	equal( $divUnconnected.width(), $divNormal.width(), "unconnected element width() is wrong see #10413" );
+	equal( $divUnconnected.innerWidth(), $divNormal.innerWidth(), "unconnected element innerWidth() is wrong see #10413" );
+	equal( $divUnconnected.outerWidth(), $divNormal.outerWidth(), "unconnected element outerWidth() is wrong see #10413" );
+	equal( $divUnconnected.outerWidth(true), $divNormal.outerWidth( true ), "unconnected element outerWidth( true ) is wrong see #10413" );
+
+	equal( $divUnconnected.height(), $divNormal.height(), "unconnected element height() is wrong see #10413" );
+	equal( $divUnconnected.innerHeight(), $divNormal.innerHeight(), "unconnected element innerHeight() is wrong see #10413" );
+	equal( $divUnconnected.outerHeight(), $divNormal.outerHeight(), "unconnected element outerHeight() is wrong see #10413" );
+	equal( $divUnconnected.outerHeight(true), $divNormal.outerHeight( true ), "unconnected element outerHeight( true ) is wrong see #10413" );
+
+	// teardown html
+	$divHiddenParent.remove();
+	$divNormal.remove();
+});
+
 test("outerHeight()", function() {
 	expect(11);