IE11 bug - javascript script continues execution after the tab is closed

Steps to reproduce:
1. Open 2 blank tabs in IE.
2. In one of them navigate to this demo page: http://jsfiddle.net/MTJ27/15/ ; it runs 4 web workers in a loop.
3. Check the CPU utilization (on a 8-core machine it should show 50%, for 4 cores or less: 100%).
4. Close the tab that displays the demo page; leave the other tab open.
5. Check the CPU utilization again -> it doesn't drop! IE still runs these web workers (IMO).
It's a bug, isn't?
Regards,
Robert

Hi,
Could you please have a share with the steps about how to reproduce the "bug" you mentioned?
I could not run the scripts under the shared URL (The run button seems not work here).
Another thing that we might take a try is to end the same task under Task Manager, and then check if the symptom would be the same.
For debugging scripts, or writing scripts that would work in a webpage, we may take use with the F12 debug tool:
Using the F12 developer tools
Best regards
Michael Shao
TechNet Community Support

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