facebook/react — pull request #1551 by spicyj (2014-05-18 01:24:02+00:00)
Title: Remove JSX tag whitelist; use case instead

With this, tags that start with a lowercase letter are assumed to be built-in and have React.DOM prepended; uppercase tags are assumed to be user-defined and are left as-is.

Not sure if we want to do this but perhaps we do!