Having recently upgraded my MacBook to run the latest version of OSX, I’ve been using the built-in Help to figure out how to configure things to the way I like them. It’s an excellent example of well designed and integrated help. Of particular note is the effect shown in the screenshot below.
An excellent example of integrating user assistance with an in-built online help system. Don’t you think?
Typing in your question to the text box, top-right of the window, dims the contents and ‘spotlights’ the items which possibly match what you are looking for. Smart, huh. There are many more examples of this kind of thing but this one caught my eye.