PostScript Language Reference (1999) [pdf]
Here’s an unpopular opinion:<p>A language like PostScript would have been a much better foundation for the web than HTML+CSS+JS.<p>Browser engines would be much simpler. The platform would have had rich design capabilities much earlier and easier. A simple Forth-style language would have been a much better compilation target for high-level app development languages than JS. And having programmability built in from the start would have forced browser developers to think about security models as an integral part of the platform.