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The SO tag details is overly broad and used by users for tagging all kind of questions. Probably it deserves a visit from Trogdor.
EDIT
As @Kara pointed out, details may refer also to HTML5 details element. To refer to such an element it would be better to define a new, specific tag (e.g. html5-details) and let the others rest in peace.
Can you update your question with the contents of your comment re the html5-details, so it's up there loud and clear that those ones will get retagged?