Add JS comment

Add JS comment to explain why there is no good way to do `noContentAvailable` call.
ampproject · Dec 4, 2018 · da772ce · da772ce
1 parent ef71a8b
commit da772ce
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/ads/baidu.js b/ads/baidu.js
@@ -48,6 +48,9 @@ export function baidu(global, data) {
       'https://dup.baidustatic.com/js/dm.js',
       () => {},
       () => {
+        // noContentAvailable should be called if parent iframe receives no message.
+        // setTimeout can work, but it's not that reliable.
+        // So, only the faliure of JS loading is dealed with for now.
         global.context.noContentAvailable();
       }
   );