Interesting fact: Firefox (or Gecko to be accurate, because there was no single “Firefox” browser back then - there was Netscape Navigator and Mozilla Application Suite) had such rendering mode, but it was quickly abandoned.[1]
https://hsivonen.fi/doctype/: “In the summer of 2000 before Netscape 6 was released, Gecko actually had parser modes that enforced HTML syntax rules and one of these modes was called the “Strict DTD”. These modes were incompatible with existing Web content and were abandoned.”
Which is a shame. Browser should be strict when rendering.
Interesting fact: Firefox (or Gecko to be accurate, because there was no single “Firefox” browser back then - there was Netscape Navigator and Mozilla Application Suite) had such rendering mode, but it was quickly abandoned.[1]
I choose to imagine that these offenses result in developers cooling their heels in the slammer rather than a browser being a picky eater.