To Reproduce:

Run HelloAlert demo

Scenarios:
Press the buttons that corresponds to different Alert dialogs and listen to the screen Reader

Expected:

The ScreenReader have to read the name of opened or closed Alert dialog and optionally the content like: "Window opened [Name]", "Window closed [Name]" or "[Name] window focused on [name] contains [list of content]"

Actual:

JAWS on Win 8: It does only read the name of opened or closed Alert dialog or button, but it does not read the optionally content like: "Window opened [Name]", "Window closed [Name]" or "[Name] window focused on [name] contains [lst of content]" .

Narrator on Win 8: 1:It does only read like "[name] window", but it does not read the optionally content like: "Window opened [Name]". 2: When we press a button to close a window,it does not read which button we have pressed at the same time it does not prompt the window is closed.

VoiceOver on MAC 10.9: It does only read the name of opened or closed Alert dialog or button, but it does not read the optionally content like: "Window opened [Name]", "Window closed [Name]" or "[Name] window focused on [name] contains [list of content]"