This feature introduces 'appearance' CSS property, which is the unprefixed version of '-webkit-appearance'.
Developers should avoid vendor-prefixed CSS properties, but Chrome have never provided unprefixed version of '-webkit-appearance'.
Docs: https://docs.google.com/document/d/178JUQ6Nx0VnXPeDu_Y_rGDAF-6ZymvmQCa6xJa-13gk/edit?usp=sharing
Explainers: N/A