The size grid is used here as a background image. This text is styled using CSS on this page (View Source to see it).

> Download the background image (Right-click/Win or Control-click/Mac)
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This text would appear in the bottom right corner of the browser window at 800 x 600 resolution.

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Is your browser wider than 1024? Wider than 1280? Most people do not open the browser window wider than 1024.