Step aside, Google Docs, there's a new JavaScript tour de force in town. I'm talking about the latest project from programmer Fabrice Bellard, a JavaScript program that emulates an x86 processor fast enough to run Linux in a Web browser. The JavaScript PC Emulator can do the work of an Intel 486 chip from the 1990s, but doesn't have a built-in floating point unit for numeric processing, Bellard said. Happily, Linux itself can emulate that, and a version of the operating system's core--2.6.20--runs on the foundation.