Currently UI Extensions beta allows opening an iframe modal: Accounts Dashboard | HubSpot
However, it doesn’t allow for programmatically closing an iFrame. This means that if you expose a workflow through your own website, the user can’t click a button that has side effects AND on success closes the parent iframe. This is a giant usability issue for me.
Can the iframe implementation specify a listener, or some property so that the enclosing code can programmatically close the window without requiring the user to manually click “X”?