Normative text on how the sender frame relinquishes the capability

[mustaqahmed]

This was originally reported in Chrome intent thread:

We need to expand more on the relinquishing aspect and how regaining the capability happens. We don't have any normative text in the spec that explains how it happens.

[miketaylr]

Thanks for filing @mustaqahmed!

[zcorpan]

So delegation should also consume the user activation, right?

That happens as the last step in https://wicg.github.io/capability-delegation/spec.html#monkey-patch-to-html-initiating-delegation