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<!doctype html>
<script>
function handleFocus() {
window.parent.postMessage({status: "focus"}, '*');
}
async function handleBlur() {
let didRun = false;
scheduler.postTask(() => { didRun = true; });
await scheduler.yield();
window.parent.postMessage({status: "done", didRun}, '*');
}
</script>
<input placeholder='focus me' id=input onfocus="handleFocus()" onblur="handleBlur()">