do you mean setTimeout task type has lower priority than browser-rendering/user-input? if yes, could you give me official docs link or any code example to prove it.

[rjwaltz]

source file link

function microtask() {
  console.log("microtask");
}

function task() {
  console.log("task");
}

setTimeout(task, 0);
queueMicrotask(microtask);

1. Log "microtask"
2. Return to the event loop and allow rendering/input callbacks to occur if appropriate
3. Log "task"