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alt attribute and the title attribute are complementary and do different things. The alt attribute is what's displayed if the image doesn't load; this is different than the title attribute, which tells you what will happen if you click on the image (assuming it's a link). For example, for the MetaFilter logo, I'd do this: alt="MetaFilter logo" title="MetaFilter home page". Before most browsers added support for the alt attribute, some web developers misused the title attribute to get the "tool tip" effect.
posted by grabbingsand at 6:11 AM on March 28, 2002