WPS: PostScript for the Web
http://logand.com/sw/wps/index.html

Welcome to WPS, a PostScript and PDF interpreter for HTML 5 canvas. Note that to see and run the examples, JavaScript must be enabled and your browser must support HTML 5 canvas (latest Firefox, Opera and Chrome should work). This document allows you to try simple PostScript programs in the WPS sandbox. A few examples are presented here accompanied by a brief description of the interpreter and listing some implementation notes for my future reference.

Interprets PDF files for output with HTML 5's <canvas> element

PostScript、インタープリタ

Really neat thing: a postscript interpreter written in JavaScript using Canvas as a drawing surface. Not sure how practical this is, but it sure is fun thing.