I made the change to the editor's draft: http://dvcs.w3.org/hg/webcomponents/rev/e0dfe2ac8104
You can read the shiny new parts of the spec here: http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#extensions-to-element Please let me know if I goofed up something, preferably by filing bugs :) :DG<
