2020-05-08 UTC
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[chrisaldrich] For updating content on old posts in the past I've used something like <ins datetime="2020-05-08T15:41:09+00:00">This is the update</ins> with a snippet of CSS to make it more visually obvious on the page. Here's an example page with two of them with the date stamp that appears visually on the page instead of within the tag: https://boffosocko.com/2012/06/17/big-history/#Added%20material