[MrVandemar]

Hyperbole. It wouldn't "break" all the web pages, they would simply render differently.

[california-og]

There's a lot of sites between pure html and modern css. "Simply" rendering things differently would definitely break a lot of sites. Just imagine if browsers started defaulting to *{box-sizing: border-box;}.

[MrVandemar]

I applied it to my site for a minute. Didn't break a thing. Just noticed a slight indent to a few things.