<audio controls src="./music/rozy.wav" onplay="other_pause([0])">
Your browser does not support the
<code>audio</code> element.
</audio>
<audio controls src="./music/bab.wav" onplay="other_pause([1])">
Your browser does not support the
<code>audio</code> element.
</audio>
<script>
var a=document.getElementsByTagName("audio");
function other_pause(b){
for(i=0;i<a.length;i++){
if(!(i==b)){a[i].pause()};
}
}
</script>
// учитывайте нижний регистр
$('#myButton').data("rel");$('#myButton').attr("data-rel"); 
<button class="cve" data-rel="69c99408142132">S</button>
<button class="cve" data-rel="69c99408143167">M</button>
<button class="cve" data-rel="69c99408143177">L</button>document.addEventListener('click', function(e) {
if (e.target.classList.contains('cve')) {
document.querySelector('#bodyone').dataset.rel = e.target.dataset.rel;
}
});$(document).on('click','button.cve', function(){
var datarel = $(this).attr("data-rel");
$("#bodyone").attr('data-rel', datarel)
});