Set the property corresponding to a boolean attribute when setting to true. Fixes #9103.

- Once boolean properties had been modified natively, setting the attribute no longer set the current value

src/attributes.js

@@ -301,7 +301,7 @@ jQuery.extend({
 			return jQuery( elem )[ name ]( value );
 		}
 		
-		var ret, hooks,
+		var ret, hooks, boolProp,
 			notxml = nType !== 1 || !jQuery.isXMLDoc( elem );
 		
 		// Normalize the name if needed
@@ -326,7 +326,12 @@ jQuery.extend({
 			} else {
 
 				// Set boolean attributes to the same name
+				// Also set the DOM property
 				if ( value === true && !rspecial.test( name ) ) {
+					boolProp = jQuery.propFix[ name ] || name;
+					if ( !rinvalidChar.test( boolProp ) && typeof elem[ boolProp ] === "boolean" ) {
+						elem[ boolProp ] = true;
+					}
 					value = name.toLowerCase();
 				}
 
@@ -338,7 +343,6 @@ jQuery.extend({
 			return hooks.get( elem, name );
 
 		} else {
-			var boolProp;
 
 			// Align boolean attributes with corresponding properties
 			// Do not check the property if the name contains characters

test/unit/attributes.js

@@ -163,7 +163,8 @@ test("attr(String, Object)", function() {
 	equals( jQuery("#name").attr("name"), "something", "Set name attribute" );
 	jQuery("#name").attr("name", null);
 	equals( jQuery("#name").attr("name"), undefined, "Remove name attribute" );
-	jQuery("#check2").attr("checked", true);
+
+	jQuery("#check2").prop("checked", true).prop("checked", false).attr("checked", true);
 	equals( document.getElementById("check2").checked, true, "Set checked attribute" );
 	equals( jQuery("#check2").prop("checked"), true, "Set checked attribute" );
 	equals( jQuery("#check2").attr("checked"), "checked", "Set checked attribute" );