Anyone recognize this Table of Contents plugin – partially collapsible list

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I’m starting to see a style of Table of Contents that shows the first three headings, then has a view more link. Anyone know what plugin this is? It seems like a good compromise to completely collapsed, or a completely visible (long) list.

Two examples of sites that use it:

[https://www.iheartnaptime.net/flank-steak-tacos/])

[https://busytoddler.com/alphabet-scoop-transfer/])

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