Popover with carat

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I'm trying to create a Popover component with a triangular carat that extends out from the activator button, but I can't find this in any props or documentation. The default Popover is a basic rectangle. This is fairly common in built-in Shopify tables, like the example here from the Analytics Dashboard in every store.

Screen Shot 2020-06-22 at 8.19.36 PM.png


Am I missing something obvious or is there a trick to this?