HI, I can't find contained element in the document. And I think there are 2 more tag name: accordion-heading and accordion-group. Can you verify again?

Look deep into the document. I think almost every AngularUI directive can be a new html tag name?

You're right, I was just adding them as I came across them, though, strangely, accordion-heading and accordion-group were both highlighted before I sent this pull request.

Can you collection all possible elements and update to this branch? Thanks

accordion-heading and accordion-group is highlighted might casued by -.
It will let the element recognized as custom element.