External javascript sandboxing breaks PrototypeJS

External Issue #4274652


Aug 18, 2015
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Steps to reproduce


Repro Steps:

Build website that pulls in external javascript. Then try to do a .toString on a function in that external javascript.

This is seen with PrototypeJS. Build an external javascript file that has prototype included and then try to make a class, and then make a subclass. When trying to instantiate the subclass it will not work.

Expected Results:

Expected behavior is to be able to .toString a function and get the string representation back.

Actual Results:

Dev Channel specific:



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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Christian F.”

      Changed Assigned To from “Christian F.” to “Justin R.”

      Changed Assigned To to “Venkat K.”

      Changed Assigned To from “Venkat K.” to “Steve B.”

      Changed Assigned To from “Steve B.” to “IE S.”

      Changed Status to “External”

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