2.3. Images
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As a general rule your site should not contain large images, or too
many of them, unless they are explicitly linked to as such. (they are slow to
download with slow connectivity)
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Make sure you keep a copy of the original loss-less images and
resize them and compress them as you see fit.
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All images must have "alt" attributes (or else blind and other disabled people
cannot understand them).
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Using images as links when text can do,
is considered a bad idea (since the text will load much faster).
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If you want to have a navigation image, include some textual links below it.
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Animated images are generally bad if they appear at primary pages of the site.
Make sure your ads, if you have any, are non-animated.
Written by Shlomi Fish