What is the proper name for "notification bars" in web design?

Are you talking about a comfirmation pop-up message?

Generally, when you’re doing your use cases for a site, you would document the “happy path” actions of the user first, and account for all the actions that the user could deviate from the happy path. You need to start with the site architecture—wireframes and site flow. Create the use case from that, and write your error messages or confirmation messaging from that.

You’re talking about things like the white or blue bars that show up at the top of a page on Fluther, right? Like if you flag a post, you get a blue bar saying “thanks for helping us pick out this bad apple.” What’s wrong with calling those “notification blocks”? I like it, it seems pretty generic, and I don’t know of any technical term.