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<link rel="import" href="../iron-flex-layout/iron-flex-layout.html">
<link rel="import" href="../iron-range-behavior/iron-range-behavior.html">
<link rel="import" href="../paper-styles/color.html">

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Material design: [Progress & activity](https://www.google.com/design/spec/components/progress-activity.html)

The progress bars are for situations where the percentage completed can be
determined. They give users a quick sense of how much longer an operat