*Contact emails*
jfernan...@igalia.com

*Specification*
https://html.spec.whatwg.org/multipage/system-state.html#custom-handlers

*Summary*
The proposed `setRPHRegistrationMode` WebDriver extension command places
the user agent in a mode where it will automatically accept or reject
(depending on the mode) future Custom Protocol Handlers registrations.
This allows full end-to-end testing of Custom Handlers API (eg,
registerProtocolHandler), which normally requires user interaction to
confirm the user's consent to the protocol registration.

I'm planning to implement and ship this testing feature, if there are no
objections.

There is an WIP PR that is still under consideration, and pending of
positive signals, or lack of objections, from implementors.
See https://github.com/whatwg/html/pull/8267 for more details.

*Motivation*
The HTML spec states in the Custom Handler section that user agents may
launch a prompt dialog during the registration of a custom protocol handler:

A user agent could, for instance, prompt the user and offer the user the
opportunity to add the site to a shortlist of handlers, or make the
handlers their default, or cancel the request. User agents could also
silently collect the information, providing it only when relevant to the
user.

Currently, there are only manual tests for the registerProtocolHandler
method:

https://github.com/web-platform-tests/wpt/blob/master/html/webappapis/system-state-and-capabilities/the-navigator-object/protocol-handler-fragment-nosw-manual.https.html

The main problem is that Chrome, and also Firefox, launch a prompt
dialog to ask the user for confirmation to register the protocol handler.

We could provide testing automation if we had a WebDriver extension
command that would autogrant or autoreject the registration request.

*Tracking bug*
https://bugs.chromium.org/p/chromium/issues/detail?id=1359103

*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5153153574502400

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