guage governing permissions and
limitations under the License.
==============================================================================-->
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1, user-scalable=yes">
    <link rel="stylesheet" href="./style.css">
    <title>Player with Callback Demo</title>

    <style>
      button {
        display: block;
  