material-design-lite/src/progress/snippets/progress-default.html

Material Design Components in CSS, JS and HTML

<!-- Simple MDL Progress Bar -->
<div id="p1" class="mdl-progress mdl-js-progress"></div>
<script>
  document.querySelector('#p1').addEventListener('mdl-componentupgraded', function() {
    this.MaterialProgress.setProgress(44);
  });
</script>