I think it’s because that repo is from 7 years ago, when browser support[1][2] for components wasn’t as widespread or comprehensive. [1] See the history sectio

I think it’s because that repo is from 7 years ago, when browser support[1][2] for components wasn’t as widespread or comprehensive. [1] See the history section of https://en.m.wikipedia.org/wiki/Web_Components https://en.m.wikipedia.org/wiki/Web_Components [2] https://caniuse.com/?search=web%20components https://caniuse.com/?search=web%20components