Reduce the boolean list only to those that have corresponding IDLs that don't...

Reduce the boolean list only to those that have corresponding IDLs that don't require being added to propFix; only set the IDL if it exists

- See http://jsfiddle.net/timmywil/u5NLn/ for how boolean attributes are handled in every browser.

src/attributes.js

@@ -6,7 +6,7 @@ var rclass = /[\n\t\r]/g,
 	rtype = /^(?:button|input)$/i,
 	rfocusable = /^(?:button|input|object|select|textarea)$/i,
 	rclickable = /^a(?:rea)?$/i,
-	rboolean = /^(?:autofocus|autoplay|async|checked|controls|declare|defer|disabled|draggable|formnovalidate|hidden|ismap|loop|multiple|muted|noresize|noshade|nowrap|novalidate|open|pubdate|readonly|required|reversed|scoped|seamless|selected|truespeed)$/i,
+	rboolean = /^(?:autofocus|autoplay|async|checked|controls|defer|disabled|hidden|loop|multiple|open|readonly|required|scoped|selected)$/i,
 	rinvalidChar = /\:/,
 	formHook, boolHook;
 
@@ -311,15 +311,15 @@ jQuery.extend({
 		hooks = jQuery.attrHooks[ name ];
 
 		if ( !hooks ) {
-			// Use formHook for forms and if the name contains certain characters
-			if ( formHook && (jQuery.nodeName( elem, "form" ) || rinvalidChar.test( name )) ) {
-				hooks = formHook;
-
 			// Use boolHook for boolean attributes
-			} else if ( rboolean.test( name ) &&
-				(typeof value === "boolean" || value === undefined) ) {
+			if ( rboolean.test( name ) &&
+				(typeof value === "boolean" || value === undefined || value.toLowerCase() === name.toLowerCase()) ) {
 
 				hooks = boolHook;
+
+			// Use formHook for forms and if the name contains certain characters
+			} else if ( formHook && (jQuery.nodeName( elem, "form" ) || rinvalidChar.test( name )) ) {
+				hooks = formHook;
 			}
 		}
 
@@ -352,6 +352,7 @@ jQuery.extend({
 	},
 
 	removeAttr: function( elem, name ) {
+		var propName;
 		if ( elem.nodeType === 1 ) {
 			name = jQuery.attrFix[ name ] || name;
 		
@@ -364,8 +365,8 @@ jQuery.extend({
 			}
 
 			// Set corresponding property to false for boolean attributes
-			if ( rboolean.test( name ) ) {
-				elem[ jQuery.propFix[ name ] || name ] = false;
+			if ( rboolean.test( name ) && (propName = jQuery.propFix[ name ] || name) in elem ) {
+				elem[ propName ] = false;
 			}
 		}
 	},
@@ -465,13 +466,19 @@ boolHook = {
 			undefined;
 	},
 	set: function( elem, value, name ) {
+		var propName;
 		if ( value === false ) {
 			// Remove boolean attributes when set to false
 			jQuery.removeAttr( elem, name );
 		} else {
 			// value is true since we know at this point it's type boolean and not false
 			// Set boolean attributes to the same name and set the DOM property
-			elem[ jQuery.propFix[ name ] || name ] = value;
+			propName = jQuery.propFix[ name ] || name;
+			if ( propName in elem ) {
+				// Only set the IDL specifically if it already exists on the element
+				elem[ propName ] = value;
+			}
+
 			elem.setAttribute( name, name.toLowerCase() );
 		}
 		return name;

test/unit/attributes.js

@@ -502,7 +502,7 @@ test("removeProp(String)", function() {
 		strictEqual( ele.nonexisting, undefined, "removeProp works correctly on non DOM element nodes (bug #7500)." );
 	});
 	jQuery.each( [commentNode, textNode, attributeNode], function( i, ele ) {
-		$ele = jQuery( ele );
+		var $ele = jQuery( ele );
 		$ele.prop( "nonexisting", "foo" ).removeProp( "nonexisting" );
 		strictEqual( ele.nonexisting, undefined, "removeProp works correctly on non DOM element nodes (bug #7500)." );
 	});