Highlight new comments since last visit

Hello gam*rs,

I have a suggestion for the Steamgifts discussions.

In short: if a comment has been added since the user last visited the discussion/giveaway page, highlight it or make it stand out.

In other words, when I open a previously unseen thread, there would be no change. When I open the discussion again the next day, any comments that have been added since my last visit would be highlighted. They'd stop being highlighted when I close the tab/window or reload the page, then repeat for any new comments after that.

I think it would make reading and participating in some of the more open-ended discussions easier.

I know ESGST has a feature that lets me mark comments as read, but it's very rudimentary, requires manual input, and rather than highlighting unread comments it fades out read comments.