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I've tested the title= attribute with unique phrases, and I've seen no evidence that search engines are using them in their algorithms right now. So, no matter how spammy someone's title attributes may appear, they're probably not doing them any good with SE rank.
I suggest using title= in a natural way with the end user in mind. Include keywords as appropriate. If search engines look at them, now or in the future, you'll be well covered.
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Simple answer - the code is valid
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