polymer_1.8.1/bower_components/iron-resizable-behavior/demo/src/x-app.html

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<link rel="import" href="../../iron-resizable-behavior.html">

<dom-module id="x-puck">
  <template>
    <style>
      :host {
        display: inline-block;
        border: 3px solid lightblue;
      }
    </style>

    <b>I'm a resize-aware, thirdifying puck at (<span>{{x}}</span> x <span>{{y}}</span>).</b>

  </template>

</dom-module>

<script>

  Polymer({

    is: 'x-puck',

    behaviors: [
      Polymer.IronResizableBehavior
    ],

    properties: {
      x: {
        type: Number,
        value: 0
      },

      y: {
        type: Number,
        value: 0
      }
    },

    listeners: {
      'iron-resize': '_onIronResize'
    },

    attached: function() {
      this.async(this.notifyResize, 1);
    },

    get parent() {
      if (this.parentNode.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
        return this.parentNode.host;
      }

      return this.parentNode;
    },

    _onIronResize: function() {
      var x = this.x = Math.floor(this.parent.offsetWidth / 3);
      var y = this.y = Math.floor(this.parent.offsetHeight / 3);

      this.translate3d(x + 'px', y + 'px', 0);
    }
  });

</script>

<dom-module id="x-app">
  <template>
    <style>
      :host {
        display: block;
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
      }
    </style>
    <x-puck></x-puck>

  </template>

</dom-module>

<script>

  Polymer({

    is: 'x-app',

    behaviors: [
      Polymer.IronResizableBehavior
    ]
  });

</script>