diff --git a/src/css.js b/src/css.js
index ec55a2411..bd131399a 100644
--- a/src/css.js
+++ b/src/css.js
@@ -123,19 +123,6 @@ function getWidthOrHeight( elem, name, extra ) {
 		styles = getStyles( elem ),
 		isBorderBox = jQuery.css( elem, "boxSizing", false, styles ) === "border-box";
 
-	// 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 );
-		}
-	}
-
 	// Some non-html elements return undefined for offsetWidth, so check for null/undefined
 	// svg - https://bugzilla.mozilla.org/show_bug.cgi?id=649285
 	// MathML - https://bugzilla.mozilla.org/show_bug.cgi?id=491668