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 #2

There is a video in original article by Reddit iframe. Without JS there is just blockquote.
We can't do anything to parse video from the blockquote so it should be unsupported.
Владислав
IV does not process JS, so with out JS there is no any iframe in original page. Page can be corrected rendered and there is link to video.

Error of your template "NESTED_ELEMENT_NOT_SUPPORTED" just says about next:

<blockquote> is not supported in <figure>: <blockquote class="reddit-card" data-card-created="1541668991"><a href="https://www.reddit.com/r/ipad/comments/9v3pma/i_think_ive_bought_a_fidget_spinner/">i think i’ve bought a fidget spinner</a> from <a href="http://www.reddit.com/r/ipad">r/ipad</a></blockquote>

Your template do not processing cases with blockquotes in figure, nothing else.
Type of issue
Author added their own content
Reported
Feb 24, 2019