The moving image below is only 49Kb and has an incredibly high resolution.

It's similar to a GIF but instead of showing moving images, it shows moving SVGs! The best part: Github supports these in their README.md files!

Getting these to work involves asciinema and svg-term-cli. After uploading the asciinema you can use the tool to download a file that you can immediately click and drag into a README, or you can use this snippet to keep things local:

> asciinema rec test.cast
  <do stuff in the terminal then ctrl-d>
> cat test.cast | svg-term --out=test.svg

It's something that I'm using extensively on bespoken.

How it works?

I was surpised to learn that moving SVGs were even a thing. But then I was reminded that animations are built into the svg spec.

• <animate> - animates individual attributes over time
• <animateTransform> - animates transformations like rotation, scaling, translation
• <animateMotion> - moves elements along a path

This is what the svg-term-cli leverages under the hood.