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Update "obtain a blob object" to handle top-level self-fetch #216

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Update "obtain a blob object" to handle top-level self-fetch #216

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2939e93
Update obtain-a-blob-object to handle top-level self-fetch
recvfrom Nov 20, 2025
172251c
Address review feedback
recvfrom Nov 25, 2025
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10 changes: 6 additions & 4 deletions index.bs
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Expand Up @@ -1320,7 +1320,7 @@ for a given asynchronous <a>read method</a> in this specification:

Web Workers allow for the use of synchronous {{File}} or {{Blob}} read APIs,
since such reads on threads do not block the main thread.
This section defines a synchronous API, which can be used within Workers [[Web Workers]].
This section defines a synchronous API, which can be used within Workers [[Workers]].
Workers can avail of both the asynchronous API (the {{FileReader}} object)
*and* the synchronous API (the {{FileReaderSync}} object).

Expand Down Expand Up @@ -1526,11 +1526,13 @@ an [=empty host=], and a [=url/path=] consisting of one element itself also a [=

<div algorithm="obtainBlobObject">
To <dfn export id=blob-url-obtain-object>obtain a blob object</dfn> given a [=blob URL entry=]
|blobUrlEntry| and an [=environment settings object=] or the string "`navigation`" |environment|,
perform the following steps. They return an [=blob URL entry/object=].
|blobUrlEntry| and an [=environment settings object=], the string "`navigation`", or the string
"`top-level-self-fetch`" |environment|, perform the following steps. They return an [=blob URL entry/object=].

1. Let |isAuthorized| be true.
1. If |environment| is not the string "`navigation`", then set |isAuthorized| to the result of [=checking for same-partition blob URL usage=] with |blobUrlEntry| and |environment|.
1. If |environment| is not the string "`navigation`" and not the string "`top-level-self-fetch`",
then set |isAuthorized| to the result of [=checking for same-partition blob URL usage=] with
|blobUrlEntry| and |environment|.
1. If |isAuthorized| is false, then return failure.
1. Return |blobUrlEntry|'s [=blob URL entry/object=].

Expand Down