Postel's law is for when it's hopeless to get to a sane standard in the near-to-mid term, as with HTML and JS back in the day. Browsers had to implement ridicul

Postel's law is for when it's hopeless to get to a sane standard in the near-to-mid term, as with HTML and JS back in the day. Browsers had to implement ridiculously lenient parsing to provide a reasonable user experience on top of terrible markup and scripts.