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That's an interesting solution but couldn't you just resize a 1px grey GIF with the width and height attributes to act as a placeholder? You could also add the dimensions to an ALT and TITLE attributes so they are displayed when you mouse over it.

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And you can always include jQuery with the overlay plugin to enhance the mouse over experience. Meanwhile, you can try to render 640x480 text in custom fonts via canvas... etc.

I believe that dummyimage thing is dead simple.

Try doing that with a print designer over your shoulder debating on two image sizes.

That's a good point.

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