I'm not on a computer to test this, but I wonder if it would be possible with the href attribute set to a fragment (#) and the ping attribute set to the URL where a favorite gets saved. I'm not sure if ping works without navigating to another page or not
My guess is it sends you to the favorite page so you are sure it has been saved there. I think it can be implemented differently, like the upvotes that are counted without a page change.
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[ 4.4 ms ] story [ 17.2 ms ] threadWhen in doubt I suggest simply emailing our moderator, TheDang: hn@ycombinator.com. They are the ultimate arbiter of these matters.