What is Web Worker in HTML5?

When some scripts are executing in HTML page that time page is going to blocking for a moment but in HTML5 have a Web Worker process to solved this blocking issues and by this blocking script send to background process.

For this features user can freely access the page without blocking. But some JavaScript objects are not accessible to HTML5 web worker like.

Parent object.
Window object.
Document object.

Thank you!

Anil

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