setTimeout and Task Queue

[demimurych]

The callback function of setTimeout doesn't immediately enter the Task Queue.
It only does so after the timer expires. However, in a web interface, this happens instantly, which is an error.

[stepancar]

Good catch.

https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timers
Says

• Set task's timer nesting level to nesting level.

• Let completionStep be an algorithm step which queues a global task on the timer task source given global to run task.

• Run steps after a timeout given global, "setTimeout/setInterval", timeout, completionStep, and id.

I think what would be nice to have here is visualisation for map of active timers https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#map-of-active-timers