about 'Computed' property in IE

[이방은]

why do not working in ie?

https://www.polymer-project.org/docs/polymer/polymer.html#computed-properties

<link rel="import" href="../../components/polymer/polymer.html">

<polymer-element name="square-element" attributes="square">
  <template>
    <input type="number" value="{{num}}"><br>
    <em>{{num}}^2 = {{square}}</em>
  </template>
  <script>
    Polymer('square-element', {
      num: 2,
      computed: {
        square: 'num * num'
      }
    });
   </script>
</polymer-element>

i tested in ie10, ie11...

thanks for your help..

[Rob Dodson]

is it working for you in other browsers?

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