Polymer.dom(this).firstElementChild undefined

[John Jones]

Whenever I try to use Polymer.dom(this).firstElementChild, it returns undefined.  By contrast, this.firstElementChild finds the element as I expect.

ready: function() {

  var child1 = Polymer.dom(this).firstElementChild; // undef

  var child2 = this.firstElementChild;  // finds my child element

  // do something with the child

}

I'm trying this because the docs for the DOM API (https://www.polymer-project.org/1.0/docs/devguide/local-dom.html#dom-api) says "All DOM manipulation must use this API, as opposed to DOM API directly on nodes."

Any ideas why this wouldn't be working?  Does the statement about not using DOM API directly really apply to properties like firstElementChild that don't manipulate the DOM?

[Michael Giuffrida]

Is your element in the light DOM or your element's local DOM (shady/shadow root)? If the latter, try Polymer.dom(this.root).firstElementChild.

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