You are developing a web application that consumes services from a third-party application.
A web worker processes the third-party application requests in the background. A page in
the application instantiates the web worker process.
You need to establish two-way communications between the web worker process and the
page.
Which two actions will achieve this goal? (Each correct answer presents a complete solution.
Choose two.)

A.
From the web worker, use the onconnect event handler of the main page to capture
events.

B.
From the main page, use the onmessage event handler of the web worker to capture
events.

C.
From the web worker, use the onmessage event handler of the main page to capture
events.

D.
From the main page, use the onconnect event handler of the web worker to capture
events.

Explanation:

http://www.w3schools.com/html/html5_serversentevents.asp
http://www.html5rocks.com/en/tutorials/workers/basics/