v149 · Permissions Policy · Security
Focus Timeline
Every focus and blur event is logged to the timeline below. Use the action buttons to trigger top-page user focus plus programmatic focus attempts inside a live iframe. Toggle the actual iframe policy to compare allowed and denied focus() calls.
Focus targets
Live iframe policy probe
Preparing iframe…
Focus timeline
00:00.000Timeline started. Use action buttons or interact with the inputs above.
see also
- Focus Hijack Guard — iframe-level focus stealing prevention
- Header Builder — generate Permissions-Policy header
- Policy Test Lab — side-by-side restricted vs unrestricted
implementation reference
Need the exact API surface, compatibility boundaries, errors, lifecycle, and source links? Read the matching gendn reference ↗