chromium/ui/file_manager/file_manager/foreground/elements/files_safe_media.html

<!--
Copyright 2016 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<style>
  #content {
    height: 100%;
    width: 100%;
  }

  #content.audio {
    height: 54px;
  }

  iframe {
    border: 0;
    display: inline-block;
    height: 100%;
    width: 100%;
  }
</style>
<div id="content" class$="[[type]]"></div>