Strong html

tools/dom/idl/dart/dart.idl

Index: tools/dom/idl/dart/dart.idl
diff --git a/tools/dom/idl/dart/dart.idl b/tools/dom/idl/dart/dart.idl
index 8342f08c5f85d9af51069ee701ab93e27f4feb03..11a8cc9519ebada9da4563cded8d1407e8ac400f 100644
--- a/tools/dom/idl/dart/dart.idl
+++ b/tools/dom/idl/dart/dart.idl
@@ -425,6 +425,18 @@ interface MIDIOutput : MIDIPort {
 [DartSuppress]
 interface MutationEvent {};
 
+// Tweaks types required for Dart strong mode.
+[DartSupplemental]
+interface HTMLCollection {
+
+    // FIXME: The index argument should not be optional.
+    getter Node? item([Default=Undefined] optional unsigned long index);
+    getter any namedItem(DOMString name);
+
+    [DartSuppress] getter Element? item([Default=Undefined] optional unsigned long index);
+    [DartSuppress] getter Element? namedItem(DOMString name);
+
+};
 
 Element implements GlobalEventHandlers;