[craz8]

This technique is the way Rails Fragment Caching works, and enables Russian Doll caching

Those terms should help you find more writing about this technique that I always forget isn’t obvious outside the Rails ecosystem

[mmahemoff]

DHH helped to popularise it with this post: https://signalvnoise.com/posts/3113-how-key-based-cache-expi...

It's been hugely influential to the way I think about scaleable pages. It's a similar idea to the cache-busting techniques well-known with URLs (https://example.com?style.css=1234 etc), but applied to page fragments recursively, where a change in any component also "revs"/"bumps" its parent components.