There is a famous document from the CSS Working Group that lists the historical mistakes in the design of CSS. It contains stuff like how box-sizing: border-box; should have been the default, which is why a lot of us still put that in starter stylesheets.
Declan Chidlow took a step I’ve never seen anyone take before in making a library to fix the mistakes. A “novelty” they call it, which… yes. Users probably shouldn’t be paying a runtime cost for this stuff; we should just work around it as we have since forever. But it’s a hilarious idea taken all the way home. Plus, it’s on Tangled, so it might be an excuse to figure out how the heck all that works.