Fixed #1039 and #1733 by going through the core API and making them text node and comment node safe.

src/core.js

@@ -251,13 +251,15 @@ jQuery.fn = jQuery.prototype = {
 
 	append: function() {
 		return this.domManip(arguments, true, false, function(elem){
-			this.appendChild( elem );
+			if (this.nodeType == 1)
+				this.appendChild( elem );
 		});
 	},
 
 	prepend: function() {
 		return this.domManip(arguments, true, true, function(elem){
-			this.insertBefore( elem, this.firstChild );
+			if (this.nodeType == 1)
+				this.insertBefore( elem, this.firstChild );
 		});
 	},
 	
@@ -402,6 +404,9 @@ jQuery.fn = jQuery.prototype = {
 
 		} else
 			return this.each(function(){
+				if ( this.nodeType != 1 )
+					return;
+
 				if ( value.constructor == Array && /radio|checkbox/.test( this.type ) )
 					this.checked = (jQuery.inArray(this.value, value) >= 0 ||
 						jQuery.inArray(this.name, value) >= 0);
@@ -722,18 +727,19 @@ jQuery.extend({
 		// internal only, use addClass("class")
 		add: function( elem, classNames ) {
 			jQuery.each((classNames || "").split(/\s+/), function(i, className){
-				if ( !jQuery.className.has( elem.className, className ) )
+				if ( elem.nodeType == 1 && !jQuery.className.has( elem.className, className ) )
 					elem.className += (elem.className ? " " : "") + className;
 			});
 		},
 
 		// internal only, use removeClass("class")
 		remove: function( elem, classNames ) {
-			elem.className = classNames != undefined ?
-				jQuery.grep(elem.className.split(/\s+/), function(className){
-					return !jQuery.className.has( classNames, className );	
-				}).join(" ") :
-				"";
+			if (elem.nodeType == 1)
+				elem.className = classNames != undefined ?
+					jQuery.grep(elem.className.split(/\s+/), function(className){
+						return !jQuery.className.has( classNames, className );	
+					}).join(" ") :
+					"";
 		},
 
 		// internal only, use is(".class")
@@ -1014,6 +1020,10 @@ jQuery.extend({
 	},
 	
 	attr: function( elem, name, value ) {
+		// don't set attributes on text and comment nodes
+		if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
+			return undefined;
+
 		var fix = jQuery.isXMLDoc( elem ) ?
 			{} :
 			jQuery.props;
@@ -1267,7 +1277,8 @@ jQuery.each({
 jQuery.each({
 	removeAttr: function( name ) {
 		jQuery.attr( this, name, "" );
-		this.removeAttribute( name );
+		if (this.nodeType == 1) 
+			this.removeAttribute( name );
 	},
 
 	addClass: function( classNames ) {

src/event.js

@@ -8,6 +8,9 @@ jQuery.event = {
 	// Bind an event to an element
 	// Original by Dean Edwards
 	add: function(element, type, handler, data) {
+		if ( element.nodeType == 3 || element.nodeType == 8 )
+			return;
+
 		// For whatever reason, IE has trouble passing the window object
 		// around, causing it to be cloned in the process
 		if ( jQuery.browser.msie && element.setInterval != undefined )
@@ -83,6 +86,10 @@ jQuery.event = {
 
 	// Detach an event or set of events from an element
 	remove: function(element, type, handler) {
+		// don't do events on text and comment nodes
+		if ( element.nodeType == 3 || element.nodeType == 8 )
+			return;
+
 		var events = jQuery.data(element, "events"), ret, index;
 
 		// Namespaced event handlers
@@ -147,6 +154,10 @@ jQuery.event = {
 
 		// Handle triggering a single element
 		} else {
+			// don't do events on text and comment nodes
+			if ( element.nodeType == 3 || element.nodeType == 8 )
+				return;
+
 			var val, ret, fn = jQuery.isFunction( element[ type ] || null ),
 				// Check to see if we need to provide a fake event, or not
 				event = !data[0] || !data[0].preventDefault;
@@ -273,7 +284,7 @@ jQuery.event = {
 		if ( event.pageX == null && event.clientX != null ) {
 			var doc = document.documentElement, body = document.body;
 			event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc.clientLeft || 0);
-			event.pageY = event.clientY + (doc && doc.scrollTop  || body && body.scrollTop  || 0) - (doc.clientLeft || 0);
+			event.pageY = event.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0) - (doc.clientLeft || 0);
 		}
 			
 		// Add which for key events
@@ -437,7 +448,7 @@ function bindReady(){
 	
 	// If Safari or IE is used
 	// Continually check to see if the document is ready
-	if  (jQuery.browser.msie || jQuery.browser.safari ) (function(){
+	if (jQuery.browser.msie || jQuery.browser.safari ) (function(){
 		try {
 			// If IE is used, use the trick by Diego Perini
 			// http://javascript.nwbox.com/IEContentLoaded/

src/fx.js

@@ -69,6 +69,9 @@ jQuery.fn.extend({
 		var optall = jQuery.speed(speed, easing, callback);
 
 		return this[ optall.queue === false ? "each" : "queue" ](function(){
+			if ( this.nodeType != 1)
+				return false;
+
 			var opt = jQuery.extend({}, optall);
 			var hidden = jQuery(this).is(":hidden"), self = this;
 			
@@ -135,6 +138,9 @@ jQuery.fn.extend({
 			return queue( this[0], type );
 
 		return this.each(function(){
+			if ( this.nodeType != 1)
+				return;
+
 			if ( fn.constructor == Array )
 				queue(this, type, fn);
 			else {

src/selector.js

@@ -96,9 +96,9 @@ jQuery.extend({
 		if ( typeof t != "string" )
 			return [ t ];
 
-		// Make sure that the context is a DOM Element
-		if ( context && !context.nodeType )
-			context = null;
+		// check to make sure context is a DOM element or a document
+		if ( context && context.nodeType != 1 && context.nodeType != 9)
+			return [ ];
 
 		// Set the correct context (if none is provided)
 		context = context || document;