Ambiguity is unfortunately one of the consequences of standards development - the larger the spec and more complex the task at hand, the more potential points need to be nailed down, so a certain level of ambiguity in a working draft simply indicates that it is, well, a working draft. However, HTML 5 is seemingly being pushed inexorably towards recommendation status with most of these ambiguities still intact, with almost no community feedback (beyond the half-dozen or so committee implementers) and with remarkably little rigor being applied to what is, without a doubt, one of the most important potential specifications to emerge from the W3C in a long time.
via xmltoday.org