Comment by chrisjj

> it's possible that both Archive.today and the Internet Archive say they have a copy of a page, but then when you open up the IA version, you might see that it renders completely differently or not at all

AT archives the page as seen, even including a screenshot.

IA archives the page as loaded, then when you view hamfistedly injects its header bar and executes the source JS. As you'd expect the result is often wrecked - or tampered.