Fix #13011. Let 'type' attribute be set if the browser allows.

src/attributes.js

 var nodeHook, boolHook, fixSpecified,
 	rclass = /[\t\r\n]/g,
 	rreturn = /\r/g,
-	rtype = /^(?:input|button)$/i,
 	rfocusable = /^(?:input|select|textarea|button|object)$/i,
 	rclickable = /^(?:a|area)$/i,
 	rboolean = /^(?:autofocus|autoplay|async|checked|controls|defer|disabled|hidden|loop|multiple|open|readonly|required|scoped|selected)$/i,
@@ -366,13 +365,9 @@ jQuery.extend({
 	attrHooks: {
 		type: {
 			set: function( elem, value ) {
-				// We can't allow the type property to be changed (since it causes problems in IE)
-				if ( rtype.test( elem.nodeName ) && elem.parentNode ) {
-					jQuery.error( "type property can't be changed" );
-				} else if ( !jQuery.support.radioValue && value === "radio" && jQuery.nodeName(elem, "input") ) {
+				if ( !jQuery.support.radioValue && value === "radio" && jQuery.nodeName(elem, "input") ) {
 					// Setting the type on a radio button after the value resets the value in IE6-9
-					// Reset value to it's default in case type is set after value
-					// This is for element creation
+					// Reset value to default in case type is set after value during creation
 					var val = elem.value;
 					elem.setAttribute( "type", value );
 					if ( val ) {

test/unit/attributes.js

@@ -221,7 +221,7 @@ test( "attr(Hash)", function() {
 });
 
 test( "attr(String, Object)", function() {
-	expect( 81 );
+	expect( 79 );
 
 	var div = jQuery("div").attr("foo", "bar"),
 		fail = false;
@@ -379,14 +379,12 @@ test( "attr(String, Object)", function() {
 
 	// Type
 	var type = jQuery("#check2").attr("type");
-	var thrown = false;
 	try {
 		jQuery("#check2").attr( "type", "hidden" );
+		ok( true, "No exception thrown on input type change" );
 	} catch( e ) {
-		thrown = true;
+		ok( true, "Exception thrown on input type change: " + e );
 	}
-	ok( thrown, "Exception thrown when trying to change type property" );
-	equal( type, jQuery("#check2").attr("type"), "Verify that you can't change the type of an input element" );
 
 	var check = document.createElement("input");
 	thrown = true;
@@ -409,14 +407,12 @@ test( "attr(String, Object)", function() {
 	equal( "checkbox", check.attr("type"), "Verify that you can change the type of an input element that isn't in the DOM" );
 
 	var button = jQuery("#button");
-	thrown = false;
 	try {
 		button.attr( "type", "submit" );
+		ok( true, "No exception thrown on button type change" );
 	} catch( e ) {
-		thrown = true;
+		ok( true, "Exception thrown on button type change: " + e );
 	}
-	ok( thrown, "Exception thrown when trying to change type property" );
-	equal( "button", button.attr("type"), "Verify that you can't change the type of a button element" );
 
 	var $radio = jQuery( "<input>", {
 		"value": "sup",