Convenient: Firefox 3’s page zoom lets you check how your layout handles window sizes twice as large as what fits on your desktop. Particularly interesting for me, as I tend to like ultra-wide header images these days.
I don’t know whether Opera lets you zoom out the same way, but nobody uses Opera; and I don’t know about the new WebKit because I don’t use the nightlies. But, whichever browser allows it, that’s an interesting use of that functionality.
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