message-vs-microtask.html

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<!DOCTYPE html>

<script>

  let draft = [];

  var resolve_manual_promise;

  let manual_promise =

    new Promise(resolve => resolve_manual_promise = resolve).then(() => draft.push('microtask'));

  let resolve_message_promise;

  let message_promise = new Promise(resolve => resolve_message_promise = resolve);

  function handle_message(event) {

    draft.push('message');

    resolve_message_promise();

  var result = Promise.all([manual_promise, message_promise]).then(() => draft);

</script>

<script src="empty.js?key=start"></script>