[](https://travis-ci.org/PolymerElements/paper-progress) ##<paper-progress> Material design: [Progress & activity](https://www.google.com/design/spec/components/progress-activity.html) <!--- ``` <custom-element-demo> <template> <script src="../webcomponentsjs/webcomponents-lite.js"></script> <link rel="import" href="../paper-styles/color.html"> <link rel="import" href="paper-progress.html"> <style is="custom-style"> paper-progress { display: block; width: 100%; margin: 20px 0; } paper-progress.slow { --paper-progress-indeterminate-cycle-duration: 5s; } paper-progress.blue { --paper-progress-active-color: var(--paper-light-blue-500); --paper-progress-secondary-color: var(--paper-light-blue-100); } paper-progress.red { --paper-progress-active-color: var(--paper-red-500); --paper-progress-secondary-color: var(--paper-red-100); } </style> <next-code-block></next-code-block> </template> </custom-element-demo> ``` --> ```html <paper-progress indeterminate class="blue"></paper-progress> <paper-progress indeterminate class="slow red"></paper-progress> <paper-progress value="40" secondary-progress="80"></paper-progress> ``` The progress bars are for situations where the percentage completed can be determined. They give users a quick sense of how much longer an operation will take. There is also a secondary progress which is useful for displaying intermediate progress, such as the buffer level during a streaming playback progress bar.