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HTML4 explicitly mentioned that definition lists could be used for marking up dialogue: http://www.w3.org/TR/REC-html40/struct/lists.html#h-10.3 This was changed in HTML5 (see: http://dev.w3.org/html5/spec/Overview.html#the-dl-element) and this is not mentioned in the document that describes the differences between the two versions.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: added "The dl now represents an association list of name-value groups, and is no longer said to be appropriate for dialogue." Rationale: Concurred with reporter's comments.
also added "element"