Allow ServiceWorker to control srcdoc iframes

Policy ID: ServiceWorkerToControlSrcdocIframeEnabled
Scope: Computer Configuration, User Configuration
Supported on: Microsoft Edge version 134, Windows 7 or later
Source: Microsoft Edge Policy Templates (version 155.0.4283.45)
Category: Microsoft Edge

Description

https://github.com/w3c/ServiceWorker/issues/765 asks srcdoc iframe with the "allow-same-origin" sandbox attribute to be under ServiceWorker control.

By default (if left unset) or when set to Enabled, Microsoft Edge makes srcdoc iframes with "allow-same-origin" sandbox attributes to be under ServiceWorker control.

Setting the policy to Disabled prevents ServiceWorker control over srcdoc iframes.

This policy is temporary and planned for deprecation in 2026.

Registry

ComputerHKEY_LOCAL_MACHINE

HKLM\Software\Policies\Microsoft\Edge View registry values

ServiceWorkerToControlSrcdocIframeEnabledREG_DWORD

UserHKEY_CURRENT_USER

HKCU\Software\Policies\Microsoft\Edge View registry values

ServiceWorkerToControlSrcdocIframeEnabledREG_DWORD

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