Nexus,
Полный код страницы выглядит вот так:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
body{
background-image:url('https://i.pinimg.com/originals/e1/96/60/e196602ce4596889a3c55760c2461606.jpg');
}
</style>
<script language="JavaScript" type="text/javascript">
var audio = new Audio('file.mp3');
audio.play();
</script>
</head>
<body></body>
</html>
вот что пишет в консоли:
Uncaught (in promise) DOMException