fix for #3688, setting type attribute on button causes IE to throw error

src/core.js

@@ -1004,7 +1004,7 @@ jQuery.extend({
 			if ( name in elem && notxml && !special ) {
 				if ( set ){
 					// We can't allow the type property to be changed (since it causes problems in IE)
-					if ( name == "type" && jQuery.nodeName( elem, "input" ) && elem.parentNode )
+					if ( name == "type" && elem.nodeName.match(/(button|input)/i) && elem.parentNode )
 						throw "type property can't be changed";
 
 					elem[ name ] = value;

test/index.html

@@ -70,7 +70,7 @@ <h2 id="userAgent"></h2>
 			<input type="text" id="name" name="name" value="name" />
 			<input type="search" id="search" name="search" value="search" />
 
-			<button id="button" name="button">Button</button>
+			<button id="button" name="button" type="button">Button</button>
 
 			<textarea id="area1" maxlength="30">foobar</textarea>
 

test/unit/core.js

@@ -463,7 +463,7 @@ test("attr(Hash)", function() {
 });
 
 test("attr(String, Object)", function() {
-	expect(19);
+	expect(21);
 	var div = jQuery("div").attr("foo", "bar"),
 		fail = false;
 	for ( var i = 0; i < div.size(); i++ ) {
@@ -537,6 +537,16 @@ test("attr(String, Object)", function() {
 	}
 	ok( thrown, "Exception thrown when trying to change type property" );
 	equals( "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");
+	var thrown = false;
+	try {
+		button.attr('type','submit');
+	} catch(e) {
+		thrown = true;
+	}
+	ok( thrown, "Exception thrown when trying to change type property" );
+	equals( "button", button.attr('type'), "Verify that you can't change the type of a button element" );
 });
 
 if ( !isLocal ) {