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Certain google sites such as GMail, Google Voice, and others show a little blue dot when they update in the background (when the window doesn't have focus). This is definitely done through a JavaScript API. I've seen at least one other website (imo.im) do it as well.
How do you make this happen in JavaScript?
If you aren't entirely sure what I'm talking about, here is an image:
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This means that the title has changed. Chrome used to indicate this with a more subtle effect as described in this question: Pinned tab on Google Chrome has a rippling or highlighting effect. It can also mean that a dialog is open on that page, such as an alert or print dialog.
To pin a tab to the left, right-click the tab and select Pin. Pinned tabs are smaller and only show the site's icon. To unpin a tab, right-click the tab and select Unpin. To move a tab to a different window, right-click on the tab and point to Move tab to another window.
This dot means that the app has a notification for you.
Apparently tabs flash automatically when you change the title, this does not work for pinned tabs however.
EDIT
Oh wait, it does work for pinned tabs, but not apps.
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