{
const div = html`<div style="transition:background 250ms linear;height:33px;">`;
yield div;
while (true) {
div.style.background = "red";
yield Promises.delay(1000, div);
div.style.background = "green";
yield Promises.delay(1000, div);
div.style.background = "blue";
yield Promises.delay(1000, div);
}
}