diff --git a/src/css/support.js b/src/css/support.js
index fb2a1b204..3ed31bb9b 100644
--- a/src/css/support.js
+++ b/src/css/support.js
@@ -102,6 +102,10 @@ define( [
 		// set in CSS while `offset*` properties report correct values.
 		// Behavior in IE 9 is more subtle than in newer versions & it passes
 		// some versions of this test; make sure not to make it pass there!
+		//
+		// Support: Firefox 70+
+		// Only Firefox includes border widths
+		// in computed dimensions. (gh-4529)
 		reliableTrDimensions: function() {
 			var table, tr, trChild, trStyle;
 			if ( reliableTrDimensionsVal == null ) {
@@ -109,7 +113,12 @@ define( [
 				tr = document.createElement( "tr" );
 				trChild = document.createElement( "div" );
 
-				table.style.cssText = "position:absolute;left:-11111px";
+				table.style.cssText = "position:absolute;left:-11111px;border-collapse:separate";
+				tr.style.cssText = "border:1px solid";
+
+				// Support: Chrome 86+
+				// Height set through cssText does not get applied.
+				// Computed height then comes back as 0.
 				tr.style.height = "1px";
 				trChild.style.height = "9px";
 
@@ -119,7 +128,9 @@ define( [
 					.appendChild( trChild );
 
 				trStyle = window.getComputedStyle( tr );
-				reliableTrDimensionsVal = parseInt( trStyle.height ) > 3;
+				reliableTrDimensionsVal = ( parseInt( trStyle.height, 10 ) +
+					parseInt( trStyle.borderTopWidth, 10 ) +
+					parseInt( trStyle.borderBottomWidth, 10 ) ) === tr.offsetHeight;
 
 				documentElement.removeChild( table );
 			}
diff --git a/test/unit/dimensions.js b/test/unit/dimensions.js
index 230f047f3..9338af3c3 100644
--- a/test/unit/dimensions.js
+++ b/test/unit/dimensions.js
@@ -627,13 +627,7 @@ QUnit.test( "width/height on an inline element with percentage dimensions (gh-36
 	}
 );
 
-// Support: Firefox 70+
-// Firefox 70 & newer fail this test but the issue there is more profound - Firefox doesn't
-// subtract borders from table row computed widths.
-// See https://github.com/jquery/jquery/issues/4529
-// See https://bugzilla.mozilla.org/show_bug.cgi?id=1590837
-// See https://github.com/w3c/csswg-drafts/issues/4444
-QUnit[ /firefox/i.test( navigator.userAgent ) ? "skip" : "test" ](
+QUnit.test(
 	"width/height on a table row with phantom borders (gh-3698)", function( assert ) {
 	assert.expect( 4 );
 
diff --git a/test/unit/support.js b/test/unit/support.js
index dde4e4197..684a397ec 100644
--- a/test/unit/support.js
+++ b/test/unit/support.js
@@ -188,7 +188,7 @@ testIframe(
 				"pixelPosition": true,
 				"radioValue": true,
 				"reliableMarginLeft": true,
-				"reliableTrDimensions": true,
+				"reliableTrDimensions": false,
 				"scrollboxSize": true
 			},
 			firefox_60: {