CSS: Workaround buggy getComputedStyle on table rows in IE/Edge

Fixes gh-4490
Closes gh-4506

src/css.js

@@ -1,6 +1,7 @@
 define( [
 	"./core",
 	"./core/access",
+	"./core/nodeName",
 	"./var/rcssNum",
 	"./var/isIE",
 	"./css/var/rnumnonpx",
@@ -11,13 +12,14 @@ define( [
 	"./css/var/swap",
 	"./css/curCSS",
 	"./css/adjustCSS",
+	"./css/support",
 	"./css/finalPropName",
 
 	"./core/init",
 	"./core/ready",
 	"./selector" // contains
-], function( jQuery, access, rcssNum, isIE, rnumnonpx, cssExpand, isAutoPx,
-	cssCamelCase, getStyles, swap, curCSS, adjustCSS, finalPropName ) {
+], function( jQuery, access, nodeName, rcssNum, isIE, rnumnonpx, cssExpand, isAutoPx,
+	cssCamelCase, getStyles, swap, curCSS, adjustCSS, support, finalPropName ) {
 
 "use strict";
 
@@ -138,14 +140,21 @@ function getWidthOrHeight( elem, dimension, extra ) {
 	}
 
 
-	// Fall back to offsetWidth/offsetHeight when value is "auto"
-	// This happens for inline elements with no explicit setting (gh-3571)
-	//
 	// Support: IE 9 - 11+
-	// Also use offsetWidth/offsetHeight for when box sizing is unreliable
-	// We use getClientRects() to check for hidden/disconnected.
-	// In those cases, the computed value can be trusted to be border-box
-	if ( ( isIE && isBorderBox || val === "auto" ) &&
+	// Use offsetWidth/offsetHeight for when box sizing is unreliable.
+	// In those cases, the computed value can be trusted to be border-box.
+	if ( ( isIE && isBorderBox ||
+
+		// Support: IE 10 - 11+, Edge 15 - 18+
+		// IE/Edge misreport `getComputedStyle` of table rows with width/height
+		// set in CSS while `offset*` properties report correct values.
+		!support.reliableTrDimensions() && nodeName( elem, "tr" ) ||
+
+		// Fall back to offsetWidth/offsetHeight when value is "auto"
+		// This happens for inline elements with no explicit setting (gh-3571)
+		val === "auto" ) &&
+
+		// Make sure the element is visible & connected
 		elem.getClientRects().length ) {
 
 		isBorderBox = jQuery.css( elem, "boxSizing", false, styles ) === "border-box";

src/css/support.js

@@ -0,0 +1,40 @@
+define( [
+	"../var/document",
+	"../var/documentElement",
+	"../var/support"
+], function( document, documentElement, support ) {
+
+"use strict";
+
+var reliableTrDimensionsVal;
+
+// Support: IE 11+, Edge 15 - 18+
+// IE/Edge misreport `getComputedStyle` of table rows with width/height
+// set in CSS while `offset*` properties report correct values.
+support.reliableTrDimensions = function() {
+	var table, tr, trChild;
+	if ( reliableTrDimensionsVal == null ) {
+		table = document.createElement( "table" );
+		tr = document.createElement( "tr" );
+		trChild = document.createElement( "div" );
+
+		table.style.cssText = "position:absolute;left:-11111px";
+		tr.style.height = "1px";
+		trChild.style.height = "9px";
+
+		documentElement
+			.appendChild( table )
+			.appendChild( tr )
+			.appendChild( trChild );
+
+		var trStyle = window.getComputedStyle( tr );
+		reliableTrDimensionsVal = parseInt( trStyle.height ) > 3;
+
+		documentElement.removeChild( table );
+	}
+	return reliableTrDimensionsVal;
+};
+
+return support;
+
+} );

test/unit/css.js

@@ -1352,6 +1352,26 @@ QUnit.test( "css('width') and css('height') should respect box-sizing, see #1100
 	assert.equal( el_dis.css( "height" ), el_dis.css( "height", el_dis.css( "height" ) ).css( "height" ), "css('height') is not respecting box-sizing for disconnected element, see #11004" );
 } );
 
+QUnit.test( "table rows width/height should be unaffected by inline styles", function( assert ) {
+	assert.expect( 2 );
+
+	var table = jQuery(
+		"<table>\n" +
+		"  <tr id=\"row\" style=\"height: 1px; width: 1px;\">\n" +
+		"    <td>\n" +
+		"      <div style=\"height: 100px; width: 100px;\"></div>\n" +
+		"    </div>\n" +
+		"  </tr>\n" +
+		"</table>"
+	);
+	var tr = table.find( "tr" );
+
+	table.appendTo( "#qunit-fixture" );
+
+	assert.ok( parseInt( tr.css( "width" ) ) > 10, "tr width unaffected by inline style" );
+	assert.ok( parseInt( tr.css( "height" ) ) > 10, "tr height unaffected by inline style" );
+} );
+
 testIframe(
 	"css('width') should work correctly before document ready (#14084)",
 	"css/cssWidthBeforeDocReady.html",

test/unit/support.js

@@ -59,21 +59,27 @@ testIframe(
 		userAgent = window.navigator.userAgent,
 		expectedMap = {
 			edge: {
+				reliableTrDimensions: false,
 				scope: undefined
 			},
 			ie_11: {
+				reliableTrDimensions: false,
 				scope: undefined
 			},
 			chrome: {
+				reliableTrDimensions: true,
 				scope: true
 			},
 			safari: {
+				reliableTrDimensions: true,
 				scope: true
 			},
 			firefox: {
+				reliableTrDimensions: true,
 				scope: true
 			},
 			ios: {
+				reliableTrDimensions: true,
 				scope: true
 			}
 		};