unserver-unify/src/app/course/chapter/html.html

<div id="html_content">
  <h3 align="center">
    {{ chapter.name }}
  </h3>
  <p class="col-md-offset-1 col-md-10 html_page" ng-bind-html="chapter.content">
  </p>
  <!-- video exist -->
  <div class="ppt_video left_bottom" ng-if="ctrl.chapter.video">
    <video autoplay="" class="audio_aln" controls="true">
      <source ng-src="{{ ctrl.getvideoUrl(ctrl.chapter.video ) }}" type="video/mp4">
        {{ 'Your browser does not support the video element' | translate }}
      </source>
    </video>
  </div>
</div>