The Instant View Editor uses a three-column layout, so you really want to use it on a desktop screen that's wide enough. Sorry for the inconvenience.

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Issue #1

There is unsupported iframe in the original article
Page must not be generated
Aleksandr
According clarifications it is permissible.
https://instantview.telegram.org/checklist#6-8-3-auxiliary-widgets

There is a link to a codepen which you can follow to see it in action.
Type of issue
IV generated for non-target page
Reported
Jun 19, 2017