I learnt today that Quake Live is no longer free-to-play and requires an upfront purchase. Challenging to do this without upsetting users!
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C++ no longer considers trivial infinite loops to be undefined behaviour! https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2809r3.html
Spotted in the release notes for the latest clang.
One cute feature of markdown I'd not noticed before: there's no syntax for images *without* a description (i.e. alt text).

https://spec.commonmark.org/0.31.2/#images
Today I learnt that you can mix HTML inline in markdown! For example, the following is valid.
Foo <hr/>
I'd assumed that you needed HTML separately, like ``` blocks, but no: https://spec.commonmark.org/0.31.2/#raw-html
Admittedly HTML is very restricted on most sites, but it's helpful for SSGs.