@Override
    public void encodeEnd(FacesContext context, Audio component) throws IOException {
        String clientId = component.getClientId(context);
        ResponseWriter writer = context.getResponseWriter();

        writer.startElement("div", component);
        writer.writeAttribute("id", clientId, "id");
        renderPassThruAttributes(context, component, HTML.LABEL_ATTRS_WITHOUT_EVENTS);

        String styleClass = component.getStyleClass();
        styleClass = styleClass == null ? Audio.CONTAINER_CLASS : Audio.CONTAINER_CLASS + " " + styleClass;
        writer.writeAttribute("class", styleClass, null);

        if (LangUtils.isNotBlank(component.getStyle())) {
            writer.writeAttribute("style", component.getStyle(), null);
        }
        encodeAudio(context, component);
        writer.endElement("div");
    }
The HTML <audio> element is used to embed sound content in documents.
primefaces/src/main/java/org/primefaces/component/audio/AudioRenderer.java