Just realized that when #Chrome and then #Firefox removed ogg #theora in 2024, they also broke the wisp-mode preview on my website.
Because ogg theora was (is?) the default format of recordmydesktop.
https://www.draketo.de/software/wisp#wisp-mode-0.3.0
Switched to mp4+vp9 now, but still: the site was broken and I had to fix it manually.
Web standards promised not to do that:
"don’t break the web" → https://developer.mozilla.org/en-US/docs/Learn_web_development/Getting_started/Web_standards/The_web_standards_model#dont_break_the_web
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