How is Linear controlling iOS edit menu in Safari

Hi from majr.app! We’re an app building a great experience on ProseMirror (open beta coming in June!)

We were wondering if anyone knows how Linear.app is achieving control of the iOS edit menu in Safari? See screenshot below. They are able to position the OS control consistently so they can predictably surface their own context menu. Appreciate any guidance or help if someone else has solved easily.

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Also want to know the trick