Do not set boolean attributes to empty string on removal. Fixes #10870. +0 bytes compressed

src/attributes.js

@@ -352,7 +352,7 @@ jQuery.extend({
 	},
 
 	removeAttr: function( elem, value ) {
-		var propName, attrNames, name, l,
+		var propName, attrNames, name, l, isBool,
 			i = 0;
 
 		if ( value && elem.nodeType === 1 ) {
@@ -364,13 +364,17 @@ jQuery.extend({
 
 				if ( name ) {
 					propName = jQuery.propFix[ name ] || name;
+					isBool = rboolean.test( name );
 
 					// See #9699 for explanation of this approach (setting first, then removal)
+					// Do not do this for boolean attributes (see #10870)
+					if ( !isBool ) {
 						jQuery.attr( elem, name, "" );
+					}
 					elem.removeAttribute( getSetAttribute ? name : propName );
 
 					// Set corresponding property to false for boolean attributes
-					if ( rboolean.test( name ) && propName in elem ) {
+					if ( isBool && propName in elem ) {
 						elem[ propName ] = false;
 					}
 				}

test/unit/attributes.js

@@ -464,7 +464,7 @@ test("attr('tabindex', value)", function() {
 });
 
 test("removeAttr(String)", function() {
-	expect(9);
+	expect( 10 );
 	var $first;
 
 	equal( jQuery("#mark").removeAttr( "class" ).attr("class"), undefined, "remove class" );
@@ -479,6 +479,9 @@ test("removeAttr(String)", function() {
 	jQuery("#text1").prop("readOnly", true).removeAttr("readonly");
 	equal( document.getElementById("text1").readOnly, false, "removeAttr sets boolean properties to false" );
 
+	jQuery("#option2c").removeAttr("selected");
+	equal( jQuery("#option2d").attr("selected"), "selected", "Removing `selected` from an option that is not selected does not remove selected from the currently selected option (#10870)");
+
 	try {
 		$first = jQuery("#first").attr("contenteditable", "true").removeAttr("contenteditable");
 		equal( $first.attr('contenteditable'), undefined, "Remove the contenteditable attribute" );