Introduction

Web worker is a JavaScript that runs in background, independently of other scripts, without affecting the performance of an HTML page. User can continue to do whatever he/she wants: clicking, selecting things, etc., while the web worker runs in background.

The HTML5 Web Worker defines an API for spawning background scripts in a web application. Web Worker allows doing things like: fire up long-running scripts to handle computationally intensive tasks without blocking the UI or other scripts to handle user interactions.