function onlyPlayOneIn(container) {
  container.addEventListener(
    "play",
    function (event) {
      audio_elements = container.getElementsByTagName("audio");
      for (i = 0; i < audio_elements.length; i++) {
        audio_element = audio_elements[i];
        if (audio_element !== event.target) {
          audio_element.pause();
        }
      }
    },
    true
  );
}

document.addEventListener("DOMContentLoaded", function () {
  onlyPlayOneIn(document.body);
});