use case/rationale document for manin content feature

Hi all,
have written an initial draft of  a use case/rationale doc for the main
content[1] feature:

http://www.w3.org/html/wg/wiki/User:Sfaulkne/main-usecases#Introduction

feedback welcome!


[1]
https://dvcs.w3.org/hg/html-extensions/raw-file/tip/maincontent/index.html
-- 
with regards

Steve Faulkner
Technical Director - TPG

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