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##<paper-ripple>

Material design: [Surface reaction](https://www.google.com/design/spec/animation/responsive-interaction.html#responsive-interaction-surface-reaction)

`paper-ripple` provides a visual effect that other paper elements can
use to simulate a rippling effect emanating from the point of contact.  The
effect can be visualized as a concentric circle with motion.

<!---
```
<custom-element-demo>
  <template>
    <script src="../webcomponentsjs/webcomponents-lite.js"></script>
    <link rel="import" href="paper-ripple.html">
    <style is="custom-style">
      div {
        height: 100px;
        width: 100%;
        box-shadow: 0 12px 15px 0 rgba(0, 0, 0, 0.24);
      }

      paper-ripple {
        color: #4285f4;
      }
    </style>
    <next-code-block></next-code-block>
  </template>
</custom-element-demo>
```
-->
```html
<div style="position: relative">
  <paper-ripple></paper-ripple>
</div
```