#8150 - When removing the width and height attributes in IE6/7, setting to "" actually sets to 0 instead of auto

- Having fixed this automatically with the use of removeAttribute in browsers that support it, this will fix it for IE6/7 as well.

- This has no effect on width/height styles set elsewhere( test added to removeAttr )

- With this addition, I need to call attr in removeAttr for IE6/7, which means boolean calls like .attr("checked", "") will no longer remove the attribute, which I think is fine.  .attr("checked", false) will still remove.  If I had left it, it would have gone in an infinite loop since setting to empty string is the only way to remove it in these browsers.

- The hrefNormalized hooks were returning null if they weren't present.  Added the null check to the getter.

- Now that the style support fails in IE8 as well due to uppercasing everything, no need to have style included with the hrefNormalized hooks

src/attributes.js

@@ -338,18 +338,13 @@ jQuery.extend({
 			name = jQuery.attrFix[ name ] || name;
 		
 			if ( jQuery.support.getSetAttribute ) {
+				// Use removeAttribute in browsers that support it
 				elem.removeAttribute( name );
 			} else {
-				// Only style is a special case.
+				jQuery.attr( elem, name, "" );
-				if ( name === "style" ) {
-					elem.style.cssText = "";
-				} else {
-					elem.setAttribute( name, "" );
-					// Attempt to remove completely with DOM level 1
 				elem.removeAttributeNode( elem.getAttributeNode( name ) );
 			}
 		}
-		}
 	},
 
 	attrHooks: {
@@ -448,15 +443,28 @@ if ( !jQuery.support.getSetAttribute ) {
 			}
 		}
 	};
+
+	// Set width and height to auto instead of 0 on empty string( Bug #8150 )
+	// This is for removals
+	jQuery.each([ "width", "height" ], function( i, name ) {
+		jQuery.attrHooks[ name ] = jQuery.extend( jQuery.attrHooks[ name ], {
+			set: function( elem, value ) {
+				if ( value === "" ) {
+					elem.setAttribute( name, "auto" );
+					return value;
+				}
+			}
+		});
+	});
 }
 
 // Remove certain attrs if set to false
 jQuery.each([ "selected", "checked", "readOnly", "disabled" ], function( i, name ) {
 	jQuery.attrHooks[ name ] = jQuery.extend( jQuery.attrHooks[ name ], {
 		set: function( elem, value ) {
-			if ( !value ) {
+			if ( value === false ) {
 				jQuery.removeAttr( elem, name );
-				return false;
+				return value;
 			}
 		}
 	});
@@ -464,10 +472,11 @@ jQuery.each([ "selected", "checked", "readOnly", "disabled" ], function( i, name
 
 // Some attributes require a special call on IE
 if ( !jQuery.support.hrefNormalized ) {
-	jQuery.each([ "href", "src", "style", "width", "height", "list" ], function( i, name ) {
+	jQuery.each([ "href", "src", "width", "height", "list" ], function( i, name ) {
 		jQuery.attrHooks[ name ] = jQuery.extend( jQuery.attrHooks[ name ], {
 			get: function( elem ) {
-				return elem.getAttribute( name, 2 );
+				var ret = elem.getAttribute( name, 2 );
+				return ret === null ? undefined : ret;
 			}
 		});
 	});

test/unit/attributes.js

@@ -76,7 +76,7 @@ test("prop(String, Object)", function() {
 });
 
 test("attr(String)", function() {
-	expect(31);
+	expect(32);
 
 	equals( jQuery('#text1').attr('type'), "text", 'Check for type attribute' );
 	equals( jQuery('#radio1').attr('type'), "radio", 'Check for type attribute' );
@@ -90,6 +90,7 @@ test("attr(String)", function() {
 	equals( jQuery('#text1').attr('name'), "action", 'Check for name attribute' );
 	ok( jQuery('#form').attr('action').indexOf("formaction") >= 0, 'Check for action attribute' );
 	equals( jQuery('#form').attr('blah', 'blah').attr('blah'), 'blah', 'Set non-existant attribute on a form' );
+	equals( jQuery('#foo').attr('height'), undefined, 'Non existent height attribute should return undefined' );
 	
 	// [7472] & [3113] (form contains an input with name="action" or name="id")
 	var extras = jQuery('<input name="id" name="name" /><input id="target" name="target" />').appendTo('#testForm');
@@ -173,7 +174,7 @@ test("attr(Hash)", function() {
 });
 
 test("attr(String, Object)", function() {
-	expect(30);
+	expect(29);
 
 	var div = jQuery("div").attr("foo", "bar"),
 		fail = false;
@@ -196,8 +197,6 @@ test("attr(String, Object)", function() {
 	equals( jQuery("#name").attr('name'), undefined, 'Remove name attribute' );
 	jQuery("#check2").attr('checked', true);
 	equals( document.getElementById('check2').checked, true, 'Set checked attribute' );
-	jQuery("#check2").attr('checked', '');
-	equals( document.getElementById('check2').checked, false, 'Setting checked to empty string removes it' );
 	jQuery("#check2").attr('checked', false);
 	equals( document.getElementById('check2').checked, false, 'Set checked attribute' );
 	jQuery("#text1").attr('readonly', true);
@@ -400,11 +399,12 @@ test("attr('tabindex', value)", function() {
 });
 
 test("removeAttr(String)", function() {
-	expect(4);
+	expect(5);
 	equals( jQuery('#mark').removeAttr( "class" )[0].className, "", "remove class" );
 	equals( jQuery('#form').removeAttr('id').attr('id'), undefined, 'Remove id' );
 	equals( jQuery('#foo').attr('style', 'position:absolute;').removeAttr('style').attr('style'), undefined, 'Check removing style attribute' );
 	equals( jQuery('#form').attr('style', 'position:absolute;').removeAttr('style').attr('style'), undefined, 'Check removing style attribute on a form' );
+	equals( jQuery('#fx-test-group').attr('height', '3px').removeAttr('height').css('height'), "1px", 'Removing height attribute has no effect on height set with style attribute' );
 });
 
 test("removeProp(String)", function() {