Adjust jQuery('html') detection to only match when html starts with '<' (not counting space characters). Fixes #11290.

src/core.js

@@ -49,7 +49,8 @@ var
 
 	// A simple way to check for HTML strings
 	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
-	rquickExpr = /^(?:[^#<]*(<[\w\W]+>)[^>]*|#([\w-]*))$/,
+	// Strict HTML recognition (#11290: must start with <)
+	rquickExpr = /^(?:(<[\w\W]+>)[^>]*|#([\w-]*))$/,
 
 	// Match a standalone tag
 	rsingleTag = /^<(\w+)\s*\/?>(?:<\/\1>|)$/,

src/sizzle

@@ -1 +1 @@
-Subproject commit 20ad5f811e22bf8528d8c33f0e7966fdb461c55a
+Subproject commit 8c6ed151bdfd03b8a8ec3707963caada8e73d041

test/unit/core.js

@@ -27,7 +27,7 @@ test("jQuery()", function() {
 		div = jQuery("<div/><hr/><code/><b/>"),
 		exec = false,
 		lng = "",
-		expected = 26,
+		expected = 22,
 		attrObj = {
 			"click": function() { ok( exec, "Click executed." ); },
 			"text": "test",
@@ -139,15 +139,9 @@ test("jQuery()", function() {
 	// manually clean up detached elements
 	elem.remove();
 
-	equal( jQuery(" <div/> ").length, 1, "Make sure whitespace is trimmed." );
-	equal( jQuery(" a<div/>b ").length, 1, "Make sure whitespace and other characters are trimmed." );
-
 	for ( i = 0; i < 128; i++ ) {
 		lng += "12345678";
 	}
-
-	equal( jQuery(" <div>" + lng + "</div> ").length, 1, "Make sure whitespace is trimmed on long strings." );
-	equal( jQuery(" a<div>" + lng + "</div>b ").length, 1, "Make sure whitespace and other characters are trimmed on long strings." );
 });
 
 test( "selector state", function() {
@@ -1206,7 +1200,7 @@ test("jQuery.proxy", function(){
 });
 
 test("jQuery.parseHTML", function() {
-	expect( 12 );
+	expect( 13 );
 
 	var html, nodes;
 
@@ -1231,6 +1225,8 @@ test("jQuery.parseHTML", function() {
 
 	equal( jQuery.parseHTML("text")[0].nodeType, 3, "Parsing text returns a text node" );
 	equal( jQuery.parseHTML( "\t<div></div>" )[0].nodeValue, "\t", "Preserve leading whitespace" );
+
+	equal( jQuery.parseHTML(" <div/> ")[0].nodeType, 3, "Leading spaces are treated as text nodes (#11290)" );
 });
 
 test("jQuery.parseJSON", function(){

test/unit/selector.js

@@ -17,7 +17,7 @@ test("element - jQuery only", function() {
 	ok( jQuery("#length").length, "<input name=\"length\"> cannot be found under IE, see #945" );
 	ok( jQuery("#lengthtest input").length, "<input name=\"length\"> cannot be found under IE, see #945" );
 
-	//#7533
+	// #7533
 	equal( jQuery("<div id=\"A'B~C.D[E]\"><p>foo</p></div>").find("p").length, 1, "Find where context root is a node and has an ID with CSS3 meta characters" );
 });
 
@@ -77,6 +77,18 @@ test("disconnected nodes", function() {
 	equal( $div.is("div"), true, "Make sure .is('nodeName') works on disconnect nodes." );
 });
 
+test("jQuery only - broken", 1, function() {
+	raises(function() {
+		// Setting context to null here somehow avoids QUnit's window.error handling
+		// making the e & e.message correct
+		// For whatever reason, without this,
+		// Sizzle.error will be called but no error will be seen in oldIE
+		jQuery.call( null, " <div/> " );
+	}, function( e ) {
+		return e.message.indexOf("Syntax error") >= 0;
+	}, "leading space invalid: $(' <div/> ')" );
+});
+
 testIframe("selector/html5_selector", "attributes - jQuery.attr", function( jQuery, window, document ) {
 	expect( 35 );
 

test/unit/traversing.js

@@ -114,7 +114,7 @@ test("is() with positional selectors", function() {
 				"<p id='posp'><a class='firsta' href='#'><em>first</em></a><a class='seconda' href='#'><b>test</b></a><em></em></p>"
 			).appendTo( "body" ),
 		isit = function(sel, match, expect) {
-			equal( jQuery( sel ).is( match ), expect, "jQuery( " + sel + " ).is( " + match + " )" );
+			equal( jQuery( sel ).is( match ), expect, "jQuery('" + sel + "').is('" + match + "')" );
 		};
 
 	isit( "#posp", "#posp:first", true );