Check this Mouse over effect within blockquote
I checked the revision for mouse over effect but no luck on it. how to do it? I'm not sure this is a bug.
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This is not a bug, it's a feature that's useful for puzzling sites, where you don't want to give away spoilers to people who want to figure answers out for themselves.
The syntax is
>! at the beginning of a line.
You can click "edit" on a post to view the Markdown that was used to create it.
Blockquotes, as I'm sure you know, simply don't have the exclamation mark.