Add fallback to prop for the window and document. Switch value to use the property instead of the attribute for back compat.

src/attributes.js

@@ -302,6 +302,11 @@ jQuery.extend({
 			return jQuery( elem )[ name ]( value );
 		}
 
+		// Fallback to prop when attributes are not supported
+		if ( !("getAttribute" in elem) ) {
+			return jQuery.prop( elem, name, value );
+		}
+
 		var ret, hooks,
 			notxml = nType !== 1 || !jQuery.isXMLDoc( elem );
 
@@ -381,7 +386,7 @@ jQuery.extend({
 					// 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
-					var val = elem.getAttribute("value");
+					var val = elem.value;
 					elem.setAttribute( "type", value );
 					if ( val ) {
 						elem.value = val;
@@ -485,6 +490,24 @@ boolHook = {
 	}
 };
 
+// Use the value property for back compat
+// Use the formHook for button elements in IE6/7 (#1954)
+jQuery.attrHooks.value = {
+	get: function( elem, name ) {
+		if ( formHook && jQuery.nodeName( elem, "button" ) ) {
+			return formHook.get( elem, name );
+		}
+		return elem.value;
+	},
+	set: function( elem, value, name ) {
+		if ( formHook && jQuery.nodeName( elem, "button" ) ) {
+			return formHook.set( elem, value, name );
+		}
+		// Does not return so that setAttribute is also used
+		elem.value = value;
+	}
+};
+
 // IE6/7 do not support getting/setting some attributes with get/setAttribute
 if ( !jQuery.support.getSetAttribute ) {
 
@@ -492,7 +515,7 @@ if ( !jQuery.support.getSetAttribute ) {
 	jQuery.attrFix = jQuery.propFix;
 	
 	// Use this for any attribute on a form in IE6/7
-	formHook = jQuery.attrHooks.name = jQuery.attrHooks.value = jQuery.valHooks.button = {
+	formHook = jQuery.attrHooks.name = jQuery.valHooks.button = {
 		get: function( elem, name ) {
 			var ret;
 			ret = elem.getAttributeNode( name );

test/unit/attributes.js

@@ -144,7 +144,7 @@ test("attr(Hash)", function() {
 });
 
 test("attr(String, Object)", function() {
-	expect(59);
+	expect(66);
 
 	var div = jQuery("div").attr("foo", "bar"),
 		fail = false;
@@ -206,9 +206,6 @@ test("attr(String, Object)", function() {
 	equals( document.getElementById("name").maxLength, 5, "Set maxlength attribute" );
 	jQuery("#name").attr("maxLength", "10");
 	equals( document.getElementById("name").maxLength, 10, "Set maxlength attribute" );
-	var $p = jQuery("#firstp").attr("nonexisting", "foo");
-	equals( $p.attr("nonexisting"), "foo", "attr(name, value) works correctly for non existing attributes (bug #7500).");
-	$p.removeAttr("nonexisting");
 
 	var $text = jQuery("#text1").attr("autofocus", true);
 	if ( "autofocus" in $text[0] ) {
@@ -227,12 +224,19 @@ test("attr(String, Object)", function() {
 
 	var attributeNode = document.createAttribute("irrelevant"),
 		commentNode = document.createComment("some comment"),
-		textNode = document.createTextNode("some text");
+		textNode = document.createTextNode("some text"),
+		obj = {};
 	
-	jQuery.each( [commentNode, textNode, attributeNode], function( i, ele ) {
+	jQuery.each( [commentNode, textNode, attributeNode], function( i, elem ) {
-		var $ele = jQuery( ele );
+		var $elem = jQuery( elem );
-		$ele.attr( "nonexisting", "foo" );
+		$elem.attr( "nonexisting", "foo" );
-		strictEqual( $ele.attr("nonexisting"), undefined, "attr(name, value) works correctly on comment and text nodes (bug #7500)." );
+		strictEqual( $elem.attr("nonexisting"), undefined, "attr(name, value) works correctly on comment and text nodes (bug #7500)." );
+	});
+
+	jQuery.each( [window, document, obj, "#firstp"], function( i, elem ) {
+		var $elem = jQuery( elem );
+		strictEqual( $elem.attr("nonexisting"), undefined, "attr works correctly for non existing attributes (bug #7500)." );
+		equal( $elem.attr("something", "foo" ).attr("something"), "foo", "attr falls back to prop on unsupported arguments" );
 	});
 
 	var table = jQuery("#table").append("<tr><td>cell</td></tr><tr><td>cell</td><td>cell</td></tr><tr><td>cell</td><td>cell</td></tr>"),
@@ -244,7 +248,7 @@ test("attr(String, Object)", function() {
 	table.attr("cellspacing", "2");
 	equals( table[0].cellSpacing, "2", "Check cellspacing is correctly set" );
 
-	equals( jQuery("#area1").attr("value"), undefined, "Value attribute retrieved correctly on textarea." );
+	equals( jQuery("#area1").attr("value"), "foobar", "Value attribute retrieves the property for backwards compatibility." );
 
 	// for #1070
 	jQuery("#name").attr("someAttr", "0");