<audio id="ding" preload="none">
<source src="ding.opus" type="audio/ogg; codecs=opus" />
<source src="ding.mp3" type="audio/mp3" />
<audio id="ding" preload="none">
<source src="ding.opus" type="audio/ogg; codecs=opus" />
<source src="ding.mp3" type="audio/mp3" />