window.postMessage and clipboardData don't work?

[Jiakui Wang]

I am recently using window.postMessage and clipboardData, they don't seem to work. 

Just want to get confirmed so that I won't waste more time trying to make them work!

Thanks!

[Günter Zöchbauer]

Do you mean both do not work or do they not work when you use them together in some way?
What does 'not work' mean'?

I use postMessage sucessfully in this test

https://github.com/dart-lang/core-elements/blob/master/test/core_media_query.dart

to communicate between the main window and a second window opened with window.open().

(window.open() and especially resizeTo() caused several troubles though)

I haven't used clipboardData for a long time, so no experience here.