Perhaps related to Embed youtube video into Details/Summary Tag
Onebox work with <details>:
But not with [details]:
Summary
[details="Summary"]
https://www.youtube.com/watch?v=5ndj6xn2P0c
[/details]
Hi @volas
This is not a bug. It has to do with the way that the encoding works with markdown.
This is true for all oneboxing activity, as per this note:
As you say, if you need to insert a video in a details tag then you can use the HTML approach instead
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