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Use the new goodness in the HTML spec http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#event-loops
(There's text in the dom.spec.whatwg.org spec that you can crib for this, around mutation observers.)
Checked in as WHATWG revision r8633. Check-in comment: Remove the obsolete integration for custom elements from the HTML spec. http://html5.org/tools/web-apps-tracker?from=8632&to=8633
https://github.com/w3c/webcomponents/commit/ffeeba6b1a3446ebc183a0ae2b7ee8445e44635d