Link: HTML Doctype declarations inventoried
October 17, 2006
Activating the Right Layout Mode Using the Doctype Declaration is pretty much summarized by its title. As a bonus, it includes a handy chart of how various browsers react to various specific DOCTYPE declarations (or did, as of when the chart was made; browser DOCTYPE behavior is an ever-changing target, and the chart is a good illustration of how much variety there can be).
(From Anne van Kesteren.)
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