| HEIGHT and WIDTH Tags
Once you've created your speedy images, make sure to include
image width and height (in pixels) in your code. This tells the
browser the dimensions of the images it will need to
download, which lets the browser begin to display a page
before images are finished loading.
You should also make sure to use ALT tags to offer alternative text that will be displayed while graphics are downloading. This means that users don't need to wait for graphics -- even speedy ones--but can jump to what they need to find.
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Yale Style Manual: Height and Width Tags
The skinny on why including dimensions in your IMG SRC tags will speed downloads.

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