Adding supported checks for XsltProcessor.

tests/html/xsltprocessor_test.dart

 library XSLTProcessorTest;
 import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_config.dart';
+import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 
 main() {
 
-  useHtmlConfiguration();
+  useHtmlIndividualConfiguration();
 
-  var isXsltProcessor =
+  group('supported', () {
+    test('supported', () {
+      expect(XsltProcessor.supported, true);
+    });
+  });
+
+  group('functional', () {
+    var isXsltProcessor =
       predicate((x) => x is XsltProcessor, 'is an XsltProcessor');
 
-  test('constructorTest', () {
-      var processor = new XsltProcessor();
-      expect(processor, isNotNull);
-      expect(processor, isXsltProcessor);
+    var expectation = XsltProcessor.supported ? returnsNormally : throws;
+
+    test('constructorTest', () {
+      expect(() {
+        var processor = new XsltProcessor();
+        expect(processor, isNotNull);
+        expect(processor, isXsltProcessor);
+      }, expectation);
     });
+  });
+
 }