This is a short post on debugging browser web workers. But in some applications, work is done inside a Web Worker, which the Developer tools doesn’t seem to debug by default. Debugging Web Workers are a simple way to run things in the background, in a separate thread than the UI one.
This is a short post on debugging web workers.
With chrome, you can navigate to chrome://inspect/#workers.
Chrome inspect web workers.
This article covers A-Z about the mobile and web app development process and answers your question on how long does it take to develop/build an app.