Why does the interactive display have a grid of lines across the image?
You may sometimes notice that a grid of lines appears in the interactive display. An example is shown to the right. This is actually the result of a browser bug generated when you use the browser’s ‘Zoom page’ control to make the images and text on the page appear larger or smaller. It occurs in Firefox, Safari, and Google Chrome (at least). The problem is that the browser is changing the displayed size for the HLA image tiles (which are 256×256 pixels), but it is not careful about exactly how the images line up, so it generates the gaps between tiles. There are two workarounds for the problem, both requiring action by the user. First, typing resetting the zoom using the View->Zoom->Reset (Firefox) or View->Actual Size (Safari/Chrome) command returns the browser to its default zoom level. That gets rid of the lines. You can also use the keyboard shortcut for this command (Cmd-0 on a Mac). The second workaround is to enable the “Zoom Text Only” option in the browser. That option is avai
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