diff --git a/src/css.js b/src/css.js
index 24ddb6708..43ba09cd3 100644
--- a/src/css.js
+++ b/src/css.js
@@ -115,21 +115,28 @@ function augmentWidthOrHeight( elem, name, extra, isBorderBox, styles ) {
 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,
+	var val,
+		valueIsBorderBox = true,
 		styles = getStyles( elem ),
 		isBorderBox = jQuery.css( elem, "boxSizing", false, styles ) === "border-box";
 
+	if ( support.gBCRDimensions() ) {
+		// Support: IE <= 11 only
+		// Running getBoundingClientRect on a disconnected node
+		// in IE throws an error.
+		if ( elem.getClientRects().length ) {
+			val = elem.getBoundingClientRect()[ name ];
+		}
+	} else {
+		// In IE8 gBCR doesn't report width & height; we need to fall back to offset*.
+		val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
+	}
+
 	// Support: IE11 only
 	// In IE 11 fullscreen elements inside of an iframe have
 	// 100x too small dimensions (gh-1764).
 	if ( document.msFullscreenElement && window.top !== window ) {
-		// Support: IE11 only
-		// Running getBoundingClientRect on a disconnected node
-		// in IE throws an error.
-		if ( elem.getClientRects().length ) {
-			val = Math.round( elem.getBoundingClientRect()[ name ] * 100 );
-		}
+		val *= 100;
 	}
 
 	// some non-html elements return undefined for offsetWidth, so check for null/undefined
@@ -320,7 +327,13 @@ jQuery.each([ "height", "width" ], function( i, name ) {
 				// certain elements can have dimension info if we invisibly show them
 				// however, it must have a current display style that would benefit from this
 				return rdisplayswap.test( jQuery.css( elem, "display" ) ) &&
-					elem.offsetWidth === 0 ?
+					// Support: Safari 8+
+					// Table columns in Safari have non-zero offsetWidth & zero
+					// getBoundingClientRect().width unless display is changed.
+					// Support: IE <= 11 only
+					// Running getBoundingClientRect on a disconnected node
+					// in IE throws an error.
+					( !elem.getClientRects().length || !elem.getBoundingClientRect().width ) ?
 						swap( elem, cssShow, function() {
 							return getWidthOrHeight( elem, name, extra );
 						}) :
diff --git a/src/css/support.js b/src/css/support.js
index 17848d535..854fa6b36 100644
--- a/src/css/support.js
+++ b/src/css/support.js
@@ -4,8 +4,8 @@ define([
 ], function( jQuery, support ) {
 
 (function() {
-	var div, container, style, a, pixelPositionVal, boxSizingReliableVal, pixelMarginRightVal,
-		reliableHiddenOffsetsVal, reliableMarginRightVal;
+	var div, container, style, a, pixelPositionVal, boxSizingReliableVal, gBCRDimensionsVal,
+		pixelMarginRightVal, reliableHiddenOffsetsVal, reliableMarginRightVal;
 
 	// Setup
 	div = document.createElement( "div" );
@@ -55,6 +55,13 @@ define([
 			return boxSizingReliableVal;
 		},
 
+		gBCRDimensions: function() {
+			if ( pixelPositionVal == null ) {
+				computeStyleTests();
+			}
+			return gBCRDimensionsVal;
+		},
+
 		pixelMarginRight: function() {
 			// Support: Android 4.0-4.3
 			if ( pixelPositionVal == null ) {
@@ -105,6 +112,10 @@ define([
 		pixelPositionVal = boxSizingReliableVal = false;
 		pixelMarginRightVal = reliableMarginRightVal = true;
 
+		// Support: IE<9
+		// In IE8 gBCR doesn't report width & height.
+		gBCRDimensionsVal = !!div.getBoundingClientRect().width;
+
 		// Check for getComputedStyle so that this code is not run in IE<9.
 		if ( window.getComputedStyle ) {
 			divStyle = window.getComputedStyle( div );
diff --git a/test/unit/css.js b/test/unit/css.js
index 34620d05e..9c3a186d0 100644
--- a/test/unit/css.js
+++ b/test/unit/css.js
@@ -904,6 +904,52 @@ testIframeWithCallback( "css('width') should work correctly before document read
 	}
 );
 
+( function() {
+	var supportsFractionalGBCR,
+		qunitFixture = document.getElementById( "qunit-fixture" ),
+		div = document.createElement( "div" );
+	div.style.width = "3.3px";
+	qunitFixture.appendChild( div );
+	supportsFractionalGBCR = jQuery.support.gBCRDimensions() &&
+		div.getBoundingClientRect().width.toFixed(1) === "3.3";
+	qunitFixture.removeChild( div );
+
+	test( "css('width') and css('height') should return fractional values for nodes in the document", function() {
+		if ( !supportsFractionalGBCR ) {
+			expect( 1 );
+			ok( true, "This browser doesn't support fractional values in getBoundingClientRect()" );
+			return;
+		}
+
+		expect( 2 );
+
+		var el = jQuery( "<div class='test-div'></div>" ).appendTo( "#qunit-fixture" );
+		jQuery( "<style>.test-div { width: 33.3px; height: 88.8px; }</style>" ).appendTo( "#qunit-fixture" );
+
+		equal( Number( el.css( "width" ).replace( /px$/, "" ) ).toFixed( 1 ), "33.3",
+			"css('width') should return fractional values" );
+		equal( Number( el.css( "height" ).replace( /px$/, "" ) ).toFixed( 1 ), "88.8",
+			"css('height') should return fractional values" );
+	} );
+
+	test( "css('width') and css('height') should return fractional values for disconnected nodes", function() {
+		if ( !supportsFractionalGBCR ) {
+			expect( 1 );
+			ok( true, "This browser doesn't support fractional values in getBoundingClientRect()" );
+			return;
+		}
+
+		expect( 2 );
+
+		var el = jQuery( "<div style='width: 33.3px; height: 88.8px;'></div>" );
+
+		equal( Number( el.css( "width" ).replace( /px$/, "" ) ).toFixed( 1 ), "33.3",
+			"css('width') should return fractional values" );
+		equal( Number( el.css( "height" ).replace( /px$/, "" ) ).toFixed( 1 ), "88.8",
+			"css('height') should return fractional values" );
+	} );
+} )();
+
 test("certain css values of 'normal' should be convertable to a number, see #8627", function() {
 	expect ( 3 );
 
diff --git a/test/unit/dimensions.js b/test/unit/dimensions.js
index c03b96c8b..f4a35981b 100644
--- a/test/unit/dimensions.js
+++ b/test/unit/dimensions.js
@@ -258,10 +258,12 @@ test("child of a hidden elem (or unconnected node) has accurate inner/outer/Widt
 	equal( $divChild.outerWidth(), $divNormal.outerWidth(), "child of a hidden element outerWidth() is wrong see #9441" );
 	equal( $divChild.outerWidth(true), $divNormal.outerWidth( true ), "child of a hidden element outerWidth( true ) is wrong see #9300" );
 
-	equal( $divChild.height(), $divNormal.height(), "child of a hidden element height() is wrong see #9441" );
-	equal( $divChild.innerHeight(), $divNormal.innerHeight(), "child of a hidden element innerHeight() is wrong see #9441" );
-	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" );
+	// Support: IE 10-11, Edge
+	// Child height is not always decimal
+	equal( $divChild.height().toFixed( 3 ), $divNormal.height().toFixed( 3 ), "child of a hidden element height() is wrong see #9441" );
+	equal( $divChild.innerHeight().toFixed( 3 ), $divNormal.innerHeight().toFixed( 3 ), "child of a hidden element innerHeight() is wrong see #9441" );
+	equal( $divChild.outerHeight().toFixed( 3 ), $divNormal.outerHeight().toFixed( 3 ), "child of a hidden element outerHeight() is wrong see #9441" );
+	equal( $divChild.outerHeight( true ).toFixed( 3 ), $divNormal.outerHeight( true ).toFixed( 3 ), "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" );
@@ -269,10 +271,12 @@ test("child of a hidden elem (or unconnected node) has accurate inner/outer/Widt
 	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" );
+	// Support: IE 10-11, Edge
+	// Child height is not always decimal
+	equal( $divUnconnected.height().toFixed( 3 ), $divNormal.height().toFixed( 3 ), "unconnected element height() is wrong see #9441" );
+	equal( $divUnconnected.innerHeight().toFixed( 3 ), $divNormal.innerHeight().toFixed( 3 ), "unconnected element innerHeight() is wrong see #9441" );
+	equal( $divUnconnected.outerHeight().toFixed( 3 ), $divNormal.outerHeight().toFixed( 3 ), "unconnected element outerHeight() is wrong see #9441" );
+	equal( $divUnconnected.outerHeight( true ).toFixed( 3 ), $divNormal.outerHeight( true ).toFixed( 3 ), "unconnected element outerHeight( true ) is wrong see #9300" );
 
 	// teardown html
 	$divHiddenParent.remove();
@@ -329,10 +333,12 @@ test("box-sizing:border-box child of a hidden elem (or unconnected node) has acc
 	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" );
+	// Support: IE 10-11, Edge
+	// Child height is not always decimal
+	equal( $divChild.height().toFixed( 3 ), $divNormal.height().toFixed( 3 ), "child of a hidden element height() is wrong see #10413" );
+	equal( $divChild.innerHeight().toFixed( 3 ), $divNormal.innerHeight().toFixed( 3 ), "child of a hidden element innerHeight() is wrong see #10413" );
+	equal( $divChild.outerHeight().toFixed( 3 ), $divNormal.outerHeight().toFixed( 3 ), "child of a hidden element outerHeight() is wrong see #10413" );
+	equal( $divChild.outerHeight( true ).toFixed( 3 ), $divNormal.outerHeight( true ).toFixed( 3 ), "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" );
@@ -340,10 +346,12 @@ test("box-sizing:border-box child of a hidden elem (or unconnected node) has acc
 	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" );
+	// Support: IE 10-11, Edge
+	// Child height is not always decimal
+	equal( $divUnconnected.height().toFixed( 3 ), $divNormal.height().toFixed( 3 ), "unconnected element height() is wrong see #10413" );
+	equal( $divUnconnected.innerHeight().toFixed( 3 ), $divNormal.innerHeight().toFixed( 3 ), "unconnected element innerHeight() is wrong see #10413" );
+	equal( $divUnconnected.outerHeight().toFixed( 3 ), $divNormal.outerHeight().toFixed( 3 ), "unconnected element outerHeight() is wrong see #10413" );
+	equal( $divUnconnected.outerHeight( true ).toFixed( 3 ), $divNormal.outerHeight( true ).toFixed( 3 ), "unconnected element outerHeight( true ) is wrong see #10413" );
 
 	// teardown html
 	$divHiddenParent.remove();
diff --git a/test/unit/support.js b/test/unit/support.js
index 07478e014..b5865b2bd 100644
--- a/test/unit/support.js
+++ b/test/unit/support.js
@@ -82,6 +82,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -114,6 +115,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": true,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -146,6 +148,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": true,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -178,6 +181,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": false,
 			"deleteExpando": false,
 			"focusin": true,
+			"gBCRDimensions": false,
 			"html5Clone": false,
 			"htmlSerialize": false,
 			"input": false,
@@ -212,6 +216,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -244,6 +249,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -276,6 +282,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -308,6 +315,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -340,6 +348,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -372,6 +381,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -404,6 +414,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,
@@ -436,6 +447,7 @@ testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Sec
 			"cssFloat": true,
 			"deleteExpando": true,
 			"focusin": false,
+			"gBCRDimensions": true,
 			"html5Clone": true,
 			"htmlSerialize": true,
 			"input": true,