QUESTION: *writing* style guides for the web

[durl <durl -at- BUFFNET -dot- NET>]

Hi,
        Those of you who read me know I'm big on citing Style Guides as my
authority when discussing the way I approach a documentation project
with a client.
        Tomorrow I'm meeting with a client who's *actually budgeted for a tech
writer* to work on the web sites his company designs, mostly for
manufacturers. Using the Archives, I checked out some web sites
purporting to be style guides, and they are, but for design, software,
"style sheets,"--not *writing*.
        Anybody know of any style guides, paper or on-line, that address, with
some authority, *writing* for the Web? I'm looking for something that,
for example:
        *       advocates bullets and lists
        *       um...well, if I knew, I wouldn't be asking!
        He presumably has designers. I want to demonstrate value-added
*writer*, since he's clued in. TIA,
        Mary
        Will tab and post

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