viewof bandwidth = {
const form = html`<form>
<input name=i type=range min=1 max=20 value=7 step=any style="width:180px;">
<output style="font-size:smaller;font-style:oblique;" name=o></output>
</form>`;
form.i.oninput = () => form.o.value = `${(form.value = form.i.valueAsNumber).toFixed(1)} bandwidth`;
form.i.oninput();
return form;
}