ndex: '-1'
  }
});
</script>
</dom-module>

<dom-module id="x-outer">
  <template>
    <x-inner id="inner">
      <slot></slot>
    </x-inner>
  </template>
  <script type="module">
import '../../polymer-legacy.js';
import { Polymer } from '../../lib/legacy/polymer-fn.js';
Polymer({
  is: 'x-outer'
});
</script>
</dom-module>

<dom-module id="x-inner">
  <script type="module">
import '../../polymer-legacy.js';
import { Polymer } from '../../lib/legacy/polymer-fn.js';
Polymer({
  is: 'x-inner',
  attached: f