Standardize on using .nodeName in place of .tagName. Fixes jQuery bug #4923.

src/ajax.js

@@ -481,7 +481,7 @@ jQuery.extend({
 			xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0,
 			data = xml ? xhr.responseXML : xhr.responseText;
 
-		if ( xml && data.documentElement.tagName == "parsererror" ) {
+		if ( xml && data.documentElement.nodeName == "parsererror" ) {
 			throw "parsererror";
 		}
 

src/attributes.js

@@ -192,7 +192,7 @@ jQuery.extend({
 		if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
 			return undefined;
 
-		var notxml = !elem.tagName || !jQuery.isXMLDoc( elem ),
+		var notxml = elem.nodeType !== 1 || !jQuery.isXMLDoc( elem ),
 			// Whether we are setting (or getting)
 			set = value !== undefined;
 
@@ -200,7 +200,7 @@ jQuery.extend({
 		name = notxml && jQuery.props[ name ] || name;
 
 		// Only do all the following if this is a node (faster for style)
-		if ( elem.tagName ) {
+		if ( elem.nodeType === 1 ) {
 
 			// These attributes require special treatment
 			var special = /href|src|style/.test( name );

src/fx.js

@@ -28,12 +28,12 @@ jQuery.fn.extend({
 				this[i].style.display = old || "";
 
 				if ( jQuery.css(this[i], "display") === "none" ) {
-					var tagName = this[i].tagName, display;
+					var nodeName = this[i].nodeName, display;
 
-					if ( elemdisplay[ tagName ] ) {
-						display = elemdisplay[ tagName ];
+					if ( elemdisplay[ nodeName ] ) {
+						display = elemdisplay[ nodeName ];
 					} else {
-						var elem = jQuery("<" + tagName + " />").appendTo("body");
+						var elem = jQuery("<" + nodeName + " />").appendTo("body");
 
 						display = elem.css("display");
 						if ( display === "none" )
@@ -41,7 +41,7 @@ jQuery.fn.extend({
 
 						elem.remove();
 
-						elemdisplay[ tagName ] = display;
+						elemdisplay[ nodeName ] = display;
 					}
 
 					jQuery.data(this[i], "olddisplay", display);

src/offset.js

@@ -39,7 +39,7 @@ if ( "getBoundingClientRect" in document.documentElement ) {
 				top += elem.offsetTop;
 				left += elem.offsetLeft;
 
-				if ( jQuery.offset.doesNotAddBorder && !(jQuery.offset.doesAddBorderForTableAndCells && /^t(able|d|h)$/i.test(elem.tagName)) ) {
+				if ( jQuery.offset.doesNotAddBorder && !(jQuery.offset.doesAddBorderForTableAndCells && /^t(able|d|h)$/i.test(elem.nodeName)) ) {
 					top  += parseFloat( computedStyle.borderTopWidth  ) || 0;
 					left += parseFloat( computedStyle.borderLeftWidth ) || 0;
 				}
@@ -127,7 +127,7 @@ jQuery.fn.extend({
 
 		// Get correct offsets
 		offset       = this.offset(),
-		parentOffset = /^body|html$/i.test(offsetParent[0].tagName) ? { top: 0, left: 0 } : offsetParent.offset();
+		parentOffset = /^body|html$/i.test(offsetParent[0].nodeName) ? { top: 0, left: 0 } : offsetParent.offset();
 
 		// Subtract element margins
 		// note: when an element has margin: auto the offsetLeft and marginLeft
@@ -149,7 +149,7 @@ jQuery.fn.extend({
 	offsetParent: function() {
 		return this.map(function(){
 			var offsetParent = this.offsetParent || document.body;
-			while ( offsetParent && (!/^body|html$/i.test(offsetParent.tagName) && jQuery.css(offsetParent, 'position') === 'static') ) {
+			while ( offsetParent && (!/^body|html$/i.test(offsetParent.nodeName) && jQuery.css(offsetParent, 'position') === 'static') ) {
 				offsetParent = offsetParent.offsetParent;
 			}
 			return offsetParent;

src/selector.js

@@ -978,7 +978,7 @@ jQuery.expr[":"] = jQuery.expr.filters;
 
 Sizzle.selectors.filters.hidden = function(elem){
 	var width = elem.offsetWidth, height = elem.offsetHeight,
-		 force = /^tr$/i.test( elem.tagName ); // ticket #4512
+		 force = /^tr$/i.test( elem.nodeName ); // ticket #4512
 	return ( width === 0 && height === 0 && !force ) ?
 		true :
 			( width !== 0 && height !== 0 && !force ) ?