Sorry for my English ablity.
I think the Web Reference Of the Apanta has some problem.
When I consult the detail info of "window" in HTML DOM Level 0 , I will alway get Function " postMessage" only .
Obviously ,the function "postMessage" is of HTML DOM Level 5 .
Similarly , I can get detail info of "Document" in HTML DOM Level 3 .
I am sorry for my English ablity . I hope you get me , and I hope my issue is usable.
Thanks , guys!