Makes sense Anna, thanks for the update!

Rick

On Sun, Feb 1, 2026 at 11:40 PM 'Anna Sato' via blink-dev <
[email protected]> wrote:

> Hi blink-dev,
>
> In Chrome M146, we plan to enable the back/forward cache (BFCache) for
> pages that use Shared Workers.
>
> Previously, the usage of Shared Workers blocked pages from entering
> BFCache. We have been experimenting with removing this restriction, and we
> are now ready to enable this behavior by default.
>
> With this change, pages holding a Shared Worker connection will be
> eligible for BFCache. However, please be aware of the following eviction
> behaviors:
>
>    - *Message from Worker*: If a page in BFCache receives a message from
>    a Shared Worker, the page will be evicted.
>    - *All connections cached*: If all pages connected to a Shared Worker
>    enter BFCache, those pages will be evicted because the Shared Worker is no
>    longer actively needed.
>
> You can view the relevant HTML spec changes in this GitHub PR
> <https://github.com/whatwg/html/pull/12086>.
>
> Separately, we are working on a change to freeze the Shared Worker and
> keep storing the pages instead of evicting them when all connected pages
> are in BFCache. We plan to start a Finch experiment for this behavior soon.
>
> Thanks,
> Anna
>
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