If you are developing a web app, you are probably using it without knowing it by using the browser's runtime environment, which itself interfaces with the OS's

If you are developing a web app, you are probably using it without knowing it by using the browser's runtime environment, which itself interfaces with the OS's task scheduling system, probably setting it's own UI tasks to higher priority. There is a recent w3c proposal to add explicit support for QoS hints to web workers: https://www.w3.org/2023/Talks/TPAC/breakouts/web-worker-qos/ https://www.w3.org/2023/Talks/TPAC/breakouts/web-worker-qos/