Guide to HTML5 Hiccups

HTML5 is the next generation of web markup, and the first web markup language created in the era of web applications. While we view many aspects of it quite favorably, we believe the specification could benefit from a few changes and clarifications, outlined below.
Validation of XHTML and HTML

The spec should clarify that an author can use XHTML or HTML syntax, that it is a coding style preference. It would be great if Henri could add a toggle to the validator that will check for syntax. Something along the lines of “Also check for XHTML syntax validity.”

While more specific toggles (e.g. “Check for quoted attributes”) may benefit some power users, the largest benefit would be realized by providing at least a high-level “XHTML syntax” toggle, which could (perhaps with progressive disclosure help text) document what it is checking in addition, like:

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