View the original community article here
Last tested: Jul 21, 2018
Want to know what your embedded users are up to? You can do this by broadcasting iframe events to the parent page. For security reasons, we can't go broadcasting Looker events to anyone, so if you want to accept the events, your domain needs to be in the "Embedded Domain Whitelist" in the Embed section of the admin panel. Cite Docs.
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