Web Workers is a powerful feature of HTML5 that hasn’t received very much attention.
with the main renderer and any of your user interface scripts on it. This allows long
and “processing-heavy” tasks to be executed without making the page unresponsive.
Like threads in other technologies, Web Workers are relatively heavyweight. You don’t
want to use them in large numbers, as each one consumes significant system resources.
Web Workers are expected to handle long tasks that rely on constrained resources (e.g.,
CPU, network bandwidth, etc.). They have a high startup cost and a high instance of
Because it is a new, evolving standard, different browsers implement the Web Workers
specification in different ways. Although some aspects of the implementation are stabilizing,
I suspect that features like access to IndexedDB will be available soon in most
modern browsers. I hope that with this book and the adoption of modern browsers we
will see more usage of this powerful API.
Start creating Web Workers and understand what they can and can’t do
Determine which browser versions support the API
Use dedicated Web Workers for tasks that consume a lot of CPU, such as data parsing
Explore use cases for creating inline Workers, such as encapsulating a web app in one page
Create a shared Worker to communicate multiple web app instances to the server, and other uses
Learn best practices for debugging Web Workers
Apply Web Workers within the server-side Node environment