It's an interesting question, because it exposes one of the great misconceptions of web design. The idea of the web is not to present pixel-perfect brochures to people, and in fact it's pretty much impossible to achieve this. Rather, the idea is to present information which can be viewed by anyone, anywhere in the world, no matter what sort of computer they have or what sort of software they use. The web is better than DTP Desktop Publishing Web Publishing results in a paper publication results in a publication which can be printed on paper, viewed online, sent by email, indexed by search engines, and converted to speech, braille, or any other form of output uses file formats which are specific to a particular software package.
Conversions are difficult and error-prone.