I want to develop a customized browser with web workers(Dedicated worker) in WinForm(c#), does DotNetBrowser support web workers? or are there other suggestions for this?
Yes, DotNetBrowser supports JavaScript web workers. You can try this yourself by opening the sample by the following link http://www.w3schools.com/html/html5_webworkers.asp in the DotNetBrowser WinForms demo application.
The demo application is available in the distribution archive which you can download on the product's website: https://www.teamdev.com/dotnetbrowser