`focus-without-user-activation` feature policy

[siliu1]

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@annevk

Title of the proposal

focus-without-user-activation feature policy

URL to the spec

https://github.com/whatwg/html/pull/4585. The spec PR needs to be updated to reflect default value of self.

URL to the spec's repository

https://github.com/whatwg/html

Issue Tracker URL

No response

Explainer URL

https://github.com/w3c/webappsec-permissions-policy/blob/main/policies/focus-without-user-activation.md

TAG Design Review URL

No response

Mozilla standards-positions issue URL

https://github.com/mozilla/standards-positions/issues/1080

WebKit Bugzilla URL

No response

Radar URL

No response

Description

The proposed feature policy focus-without-user-activation is used to prevent programmatic focus in iframe without user activation. The default value of the policy is self which is disabled for third-party context.

This issue is discussed during TPAC 2024 in webappsec and whatwg meeting.

The issue was resolved with proposed resolution:

RESOLVED: The default value of focus-without-user-activation feature policy should be self. Focus delegation should also be allowed (allow parent frame programmatically set focus into child iframe).

Webkit already requires user gesture for x origin iframes to steal focus.