Changes

<div>

<div>

     <button onclick="document.getElementById('player').play()">Play</button>

     <button onclick="document.getElementById('player').play()">Play</button>

     <button onclick="document.getElementById('player').muted=!document.getElementById('player').muted">Mute</button>

     <button onclick="document.getElementById('player').muted=!document.getElementById('player').muted">Mute/ Unmute</button>

</div>

</div>

</includeonly>

</includeonly>