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This section should instead select #hh, #sep, and #mm: "this._root.querySelector('hh').textContent = fmt(now.getHours()); this._root.querySelector('sep').style.visibility = now.getSeconds() % 2 ? 'visible' : 'hidden'; this._root.querySelector('mm').textContent = fmt(now.getMinutes());"
Thanks for the bug report. I will fix this in the next Editor's Draft.
Moved to https://github.com/w3c/webcomponents/issues/219