After you click "I've checked all of these" nodes created after that time will contain the tags td.reply-new and td.reply-new-body which can be used to style newly created nodes. For example, you can use a different background color to highlight new nodes within a thread. After you click "Clear my 'last checked' time" these tags no longer appear.

In reply to Re^7: Ability to mark specific "newest nodes" nodes as read (CSS :visited) by Danny
in thread Ability to mark specific "newest nodes" nodes as read by Danny

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