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Issue #1

this embed on original page didn't present, so you must be remove this embed
Deleted Account
This iframe has src http://interactive.nautil.us/animheros/optical/ which doesn't work anymore. While this article is not extremely old (2014), it's possible that something has broken since it was published.

style="display:none" might have been added as a "fix", or meant to be overridden by CSS or JS.

Source code contains at least some handling of such iframes regardless of "display" CSS property.
http://imgur.com/0B7eaURl.png

We can't just assume it's unrelated and can be safely removed from the article.
Declined by admin
Type of issue
IV not generated for target page
Reported
Feb 15, 2019