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+paper-ripple
+============
+
+`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.
+
+Example:
+
+```html
+<paper-ripple></paper-ripple>
+```
+
+`paper-ripple` listens to "mousedown" and "mouseup" events so it would display ripple
+effect when touches on it.  You can also defeat the default behavior and
+manually route the down and up actions to the ripple element.  Note that it is
+important if you call downAction() you will have to make sure to call
+upAction() so that `paper-ripple` would end the animation loop.
+
+Example:
+
+```html
+<paper-ripple id="ripple" style="pointer-events: none;"></paper-ripple>
+...
+<script>
+  downAction: function(e) {
+    this.$.ripple.downAction({x: e.x, y: e.y});
+  },
+  upAction: function(e) {
+    this.$.ripple.upAction();
+  }
+</script>
+```
+
+Styling ripple effect:
+
+Use CSS color property to style the ripple:
+
+```css
+paper-ripple {
+  color: #4285f4;
+}
+```
+
+Note that CSS color property is inherited so it is not required to set it on
+the `paper-ripple` element directly.
+
+
+By default, the ripple is centered on the point of contact. Apply the ``recenters`` attribute to have the ripple grow toward the center of its container.
+
+```html
+<paper-ripple recenters></paper-ripple>
+```
+
+Apply `center` to center the ripple inside its container from the start.
+
+```html
+<paper-ripple center></paper-ripple>
+```
+
+Apply `circle` class to make the rippling effect within a circle.
+
+```html
+<paper-ripple class="circle"></paper-ripple>
+```