desrosj b7a899e8aa Twenty Twenty-One: Prevent <iframe> embeds from being too narrow.
This fixes an issue where `<iframe>` embeds were being pushed to the side of the screen and compressed to the point of being unusable.

Props helen, mukesh27, poena, thorlentz.
Fixes #52004.
Built from https://develop.svn.wordpress.org/trunk@49823


git-svn-id: http://core.svn.wordpress.org/trunk@49542 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-12-17 14:05:05 +00:00
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