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Blink has getDestinationInsertionPoints() on Element and Text, but only Element is in the spec: http://w3c.github.io/webcomponents/spec/shadow/#extensions-to-element-interface
*** Bug 28185 has been marked as a duplicate of this bug. ***
Ops. bug 28185 should be duplication of this bug. I didn't notice this bug 28069. I agree that Text should have it. I thought that Node should have it, but I am feeling that it might be enough to let TextNode have it.
Fixed at https://github.com/w3c/webcomponents/commit/877b29112457177bee1a531c542b95ff46fb1c80