toolness/lernanta — comment on commit 219b09b4cf808ecf89e57106d1e1799198a3bc28
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By toolness:

Additional discussion on this topic can be found on [Trello](https://trello.com/card/board/support-postmessage-from-embedded-iframe-in-challenges/4ecb53f6514c7a000000ed22/4ecb5939ac5711000001b867).