This section highlights recent changes to the HIG that may affect your application.
The following sections are new to this version of the HIG:
The following sections include new or revised guidelines:
the section called “Designing Accessible Icons”
contains more information on low contrast icons
the section called “Popup Menus”
clarifies when to disable items and when to hide them
the section called “Interaction”
specifies that single click, not double click, should be used to activate a status notification icon
specifies that if clicking a notification icon opens a window, clicking it again should dismiss it (unless it's an explicit apply dialog)
suggests that an icon identical or similar to an application's launcher icon be used as the window icon for every window in the application.
the section called “Choosing Access Keys”
notes that the shortcut for entering unicode characters in widgets is now Shift-Ctrl-U.