Fix tests for existing elements

The type of a just created HTMLElement is never undefined, it is
actually an object of type HTMLUnknownElement. So now instead of
comparing to undefined, the tests check if the element is an instance of
HTMLUnknownElement and fails if it is.

scripts/engine.js

@@ -1176,7 +1176,7 @@ Test = (function() {
 
 				var passed = false;
 				try { 
-					passed = typeof HTMLElement != 'undefined' && element instanceof HTMLElement && this.isBlock(element) && this.closesImplicitly(elements[e]);
+					passed = element instanceof HTMLElement && !(element instanceof HTMLUnknownElement) && this.isBlock(element) && this.closesImplicitly(elements[e]);
 				} catch(error) {
 				}
 
@@ -1201,7 +1201,7 @@ Test = (function() {
 
 				var passed = false;
 				try { 
-					passed = typeof HTMLElement != 'undefined' && element instanceof HTMLElement && this.isBlock(element) && (elements[e] != 'figure' || this.closesImplicitly(elements[e]));
+					passed = element instanceof HTMLElement && !(element instanceof HTMLUnknownElement) && this.isBlock(element) && (elements[e] != 'figure' || this.closesImplicitly(elements[e]));
 				} catch(error) {
 				}
 
@@ -1245,7 +1245,7 @@ Test = (function() {
 
 			var passed = false;
 			try { 
-				passed = typeof HTMLElement != 'undefined' && element instanceof HTMLElement && (color = this.getStyle(element, 'background-color')) && (color != 'transparent');
+				passed = element instanceof HTMLElement && !(element instanceof HTMLUnknownElement) && (color = this.getStyle(element, 'background-color')) && (color != 'transparent');
 			} catch(error) {
 			}
 
@@ -1269,9 +1269,9 @@ Test = (function() {
 			var rpSupport = false;
 
 			try {
-				rubySupport = rubyElement && typeof HTMLElement != 'undefined' && rubyElement instanceof HTMLElement;
-				rtSupport = rtElement && typeof HTMLElement != 'undefined' && rtElement instanceof HTMLElement;
-				rpSupport = rpElement && typeof HTMLElement != 'undefined' && rpElement instanceof HTMLElement && this.isHidden(rpElement);
+				rubySupport = rubyElement && rubyElement instanceof HTMLElement && !(element instanceof HTMLUnknownElement);
+				rtSupport = rtElement && rtElement instanceof HTMLElement && !(element instanceof HTMLUnknownElement);
+				rpSupport = rpElement && rpElement instanceof HTMLElement && !(element instanceof HTMLUnknownElement) && this.isHidden(rpElement);
 			} catch(error) {				
 			}
 
@@ -1301,7 +1301,7 @@ Test = (function() {
 
 			var passed = false;
 			try { 
-				passed = typeof HTMLElement != 'undefined' && element instanceof HTMLElement;
+				passed = element instanceof HTMLElement && !(element instanceof HTMLUnknownElement);
 			} catch(error) {
 			}
 
@@ -1335,7 +1335,7 @@ Test = (function() {
 
 			var passed = false;
 			try { 
-				passed = typeof HTMLElement != 'undefined' && element instanceof HTMLElement;
+				passed = element instanceof HTMLElement && !(element instanceof HTMLUnknownElement);
 			} catch(error) {
 			}