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Add new strings for notRestoredReason for SharedWorker #12086

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Add new strings for notRestoredReason for SharedWorker #12086

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llannasatoll Jan 15, 2026
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llannasatoll Jan 16, 2026
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Expand Up @@ -103069,6 +103069,18 @@ interface <dfn interface>NotRestoredReasons</dfn> {
<dd>This <code>Document</code> was in the <span>owner set</span> of a
<code>SharedWorkerGlobalScope</code>.</dd>
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@rakina rakina Jan 20, 2026

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Now that we have more specific reasons and in some cases can actually BFCache with SharedWorkers, maybe add a note that this reason is only possible in implementations that don't support that, and the new reasons are the scenarios that will prevent BFCaching instead?


<dt>"<dfn data-x="blocking-sharedworker-with-no-active-client"
export><code>sharedworker-with-no-active-client</code></dfn>"</dt>
<dd>This <code>Document</code> was in the <span>owner set</span> of a
<code>SharedWorkerGlobalScope</code> that is not <span data-x="active needed worker">actively
needed</span>.</dd>
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@smaug---- smaug---- Jan 16, 2026

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I can't understand this. How is this a blocking reason?

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@llannasatoll llannasatoll Jan 20, 2026

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When all clients enter BFCache, the SharedWorker is no longer actively needed. The User Agent might choose to terminate the worker to prevent resource waste and potential privacy risks associated with keeping it alive indefinitely.

Since this termination breaks the connections held by the BFCached clients, we must evict them to prevent restoring pages in a broken state. (Ideally, the SharedWorker would be frozen in this case to allow clients to remain in BFCache.)


<dt>"<dfn data-x="blocking-sharedworker-message"
export><code>sharedworker-message</code></dfn>"</dt>
<dd>While the page was stored in <a href="#note-bfcache">back/forward cache</a>, a message was
received from a <code>SharedWorkerGlobalScope</code> whose <span>owner set</span> <span
data-x="list contains">contains</span> this <code>Document</code>.</dd>

<dt>"<dfn data-x="blocking-smartcard" export><code>smartcardconnection</code></dfn>"</dt>
<dd>The <code>Document</code> had an active <code>SmartCardConnection</code> while <span
data-x="unload a document">unloading</span>.</dd>
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