I hit this because of the size of my browser window... Steps to reproduce: 1. Go to http://graphs.mozilla.org/ and graph something. 2. Resize your browser window so there's not much space below the bottom of the graph. 3. Move your mouse over the graph to see some points. Results: <div> showing the Date and Value coordinates is either not shown or cut off. Expected results: I should be able to see the <div> always, even if values aren't displayed in it. I think we should either always have the <div> there (make it act like a placeholder) with no content in it, or just always have it showing the "Date:" and "Value:" words even if someone's not hovering the graph. I like option two, personally. We could even have the placeholder say "Hover over the graph to see exact coordinates for the point" or something.

This has been fixed for a while. That <div> has been moved to the top of the graph and is always visible. See graphs.mozilla.org.