What does "60% of page loads" mean in the Edge 152 unload event rollout?

Toru-san 85 Reputation points
2026-08-28T04:54:36.67+00:00

Hello,

I have a question regarding the following statement in the Microsoft Edge 152 release notes:

"In Edge 152 and 153, unload handlers will stop firing by default for 60% of page loads."

Could Microsoft clarify what "60% of page loads" means in practice?

Specifically, I would like to understand how this rollout is applied. Is the percentage based on:

  • Users
  • Devices
  • Browser profiles
  • Sessions
  • Individual page loads
  • Or another rollout mechanism

As an enterprise administrator, understanding the rollout methodology would help evaluate potential impact and plan validation activities before the feature reaches 100% deployment.

Thank you for any clarification.

Microsoft Edge | Other | Windows 11
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Answer accepted by question author
Carl-L 21,480 Reputation points Microsoft External Staff Moderator
2026-08-28T12:49:51.71+00:00

Hello Toru-san,

Welcome to Microsoft Q&A forum.

As I checked on Microsoft articles, there is currently no exact methodology for the 60% from Microsoft. However, based on the wording, my opinion that this could possibly not 60% of users or 60% devices, but rather it will be determined independently per navigation. In this case, I suggest that you could find a policy called ForcePermissionPolicyUnloadDefaultEnabled, which can force the current unload behavior while this gradually rollout to 100% of page loads, as I see, in Edge 155.

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  1. Toru-san 85 Reputation points
    2026-08-30T23:14:36.5566667+00:00

    Thank you for your explanation and for checking the Microsoft documentation.

    I appreciate the clarification that there is currently no published Microsoft methodology describing how the 60% rollout is determined.

    Your response helped confirm that the ambiguity comes from the current documentation rather than a misunderstanding on my side.

    Thank you again for your assistance.

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