">mixin3</div>
      <div id="mixin4">mixin4</div>
      <div id="mixin6">mixin6</div>
      <div id="mixin7">mixin7</div>
      <div id="mixin8">mixin8</div>
      <div id="mixin9">mixin9</div>
    </template>
    <script>
    HTMLImports.whenReady(function() {
      Polymer({is: 'x-child-scope'});
    });
    </script>
  </dom-module>

  <dom-module id="x-keyframes">
    <template>
      <style>
        :host {
          display: block;
          position: relative;
          border: 10px solid blue;
    