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Safari. I know that animated SVGs do work on GitHub in the browser; I just don't know why this one doesn't.

The SVG works fine in jsfiddle, which eventually led me to find https://stackoverflow.com/a/53717429 talking about 'animation' (which your SVG seems to mention, and I don't see a dur= property which GitHub does seem to support.)

It also works fine if I try to view it by itself.

How did you generate this animated SVG terminal screen capture?

asciinema to generate a raw json file, then svg-term to convert it to svg

https://github.com/asciinema/asciinema

https://github.com/marionebl/svg-term-cli

(I ended up moving the SVG assets to GitHub Pages which hopefully fixes the issue others were seeing.)