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It's an accessibility/usability option - and I'm under the impression that it's pretty standard web design to use them.
Not something to score highly in itself, but if page elements are going to figure then some limited value to h tags may make sense.
Additional comment - limited character allowance for alt tags in graphic links, to prevent crediting keyword stuffing.
Also - in code elements as having no effect - if it's not in a tag then it's not worth anything - so <!-- comments --> and css="keyword" values as worth nothing. A basic matter that, really, but possibly easy to overlook.
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