The pubdate attribute is not valid for modern HTML(5).
The h-entry microformat describes
an alternative way to achieve the same thing: a dt-published class name.
Patch: https://github.com/jmtd/ikiwiki/commit/a137103d3004cc8cec42459205684ec48af0ca11
—Jon, 2020-10-06
LGTM. In charset attribute on the script element is obsolete, I found that
itemprop="datePublished"was another way to do this, but it seems like there is no real standard way to do this anymore, so I'm happy with anything that doesn't break validators.--anarcat, 2022-09-06