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๐ง Type $$ on either side of your KaTex formula to render it instantly. This works in normal text blocks, header blocks, etc โ but also works in Name and Text properties within databases.
Example: $$\\fcolorbox{aquamarine}{black}{Hello~and~Goodbye}$$ becomes:
$\fcolorbox{aquamarine}{black}{Hello~and~Goodbye}$
Notion renders the KaTex as an inline equation.
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$\fcolorbox{aquamarine}{black}{Hello}$