Not sure, if documented anywhere, but there an exact specification what Locker-Service will NOT block?

In particular, which of the following things will be possible with Locker-Service enabled:

  • window.addEventListener() with otherWindow.postMessage() to establish secure communication over iframes-borders
  • window.setTimeout()
  • window.setIntervall()

2 Answers 2


You can view it here:-

Locker Service API Viewer

  • As far as this look here documentation.auraframework.org/lockerApiTest/… window.addEventListener() might work - but I can't really be sure without trying.
    – Uwe Heim
    Commented Dec 21, 2016 at 16:10
  • 1
    Yes window.addEventListener() is fully supported as per the doc. Please do not go by what the Lightning CLI tool says is supported as it us woefully out of date (that is being addressed). Commented Jan 4, 2017 at 14:28

We have just updated the API viewer to make it faster, more concise, and more readable:

LockerService API viewer

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