Is this Amazing? QNX had a demo of their OS with their windows environment, browser and more goodies in a 1.44 floppy disk.

I also created a Linux distribution with the Squeak smalltalk ported to SVGA lib: http://swain.webframe.org/squeak/floppy/ and remember SqueakNOS: http://squeaknos.blogspot.com

A full browser in 1.44 mb is a good target.