**
*Contact emails*
*
wanderv...@chromium.org <mailto:wanderv...@chromium.org>,
m...@chromium.org <mailto:m...@chromium.org>, miketa...@chromium.org
<mailto:miketa...@chromium.org>
Explainer
https://github.com/wanderview/quota-storage-partitioning/blob/main/explainer.md
<https://github.com/wanderview/quota-storage-partitioning/blob/main/explainer.md>
Specification
We’re actively working on adding the relevant spec concepts with the
following WIP PRs (there has been some extensive refactoring requested,
so it’s taken longer than anticipated):
https://github.com/whatwg/html/pull/8447
<https://github.com/whatwg/html/pull/8447>
https://github.com/whatwg/html/pull/8036
<https://github.com/whatwg/html/pull/8036>
https://github.com/whatwg/html/pull/8027
<https://github.com/whatwg/html/pull/8027>
https://github.com/whatwg/storage/pull/144
<https://github.com/whatwg/storage/pull/144>
Summary
We intend to partition a number of APIs in third-party contexts. This
effort is focused on partitioning APIs above the network stack. This
includes quota-managed storage, service workers, and communication APIs
(such as BroadcastChannel). See the explainer for more details:
https://github.com/wanderview/quota-storage-partitioning/blob/main/explainer.md
<https://github.com/wanderview/quota-storage-partitioning/blob/main/explainer.md>
Blink component
Blink>Storage
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EStorage>
TAG review
Early Design Review https://github.com/w3ctag/design-reviews/issues/629
<https://github.com/w3ctag/design-reviews/issues/629>
TAG review status
Closed as “Satisfied”
Risks
Interoperability and Compatibility
Gecko: Shipped/Shipping
WebKit: Shipped/Shipping
Web developers: Mixed signals
Other signals:
WebView application risks
Does this intent deprecate or change behavior of existing APIs, such
that it has potentially high risk for Android WebView-based applications?
We’re still investigating the risk for WebView, and if we should ship in
that context at a later date.
Goals for Deprecation Trial
We propose to ship two separate deprecation trials, each for
approximately one year (to give sites plenty of time to test and update,
if needed). Aspirationally, we would like to ship partitioned storage
in M112, and our goal is to have a deprecation trial available from M111
to M123.
The first
<https://bugs.chromium.org/p/chromium/issues/detail?id=1404959>is a
general-purpose deprecation trial that will allow a top-level site to
opt into unpartitioned storage, service workers, and communication APIs
for third-party contexts embedded in its site. This will give sites more
time for testing and migrating to solutions that don’t require
partitioned storage.
The second
<https://bugs.chromium.org/p/chromium/issues/detail?id=1399319>is
tailored to a behavior we discovered during the dev-trial that is known
to be used by the Firebase Auth library. This deprecation trial only
allows for unpartitioned `sessionStorage` across a navigation (which is
how the `signInWithRedirect()` method relies on storing and
postMessage’ing authentication tokens). The Firebase team is aware of
the issue (as it also affects Safari users; Firefox has worked around
the breakage by granting unpartitioned storage via a shim
<https://github.com/mozilla-extensions/webcompat-addon/blob/f58cf9e13b088fde01a0551069d23862e71e6711/src/data/shims.js#L791-L801>),
and is working to migrate their users
<https://firebase.google.com/docs/auth/web/redirect-best-practices>to
cross-browser solutions that are compatible with partitioned storage.
Given the different nature of the Firebase issue, we think it makes
sense to ship a different deprecation trial entirely.
Debuggability
DevTools has support
<https://bugs.chromium.org/p/chromium/issues/detail?id=1296581>for
partitioned storage.
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes for all others; TBD for WebView.
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes
DevTrial instructions
https://developer.chrome.com/en/blog/storage-partitioning-dev-trial
<https://developer.chrome.com/en/blog/storage-partitioning-dev-trial>
Flag name
ThirdPartyStoragePartitioning
DisableThirdPartySessionStoragePartitioningAfterGeneralPartitioning
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1191114
<https://bugs.chromium.org/p/chromium/issues/detail?id=1191114>
Launch bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1191709
<https://bugs.chromium.org/p/chromium/issues/detail?id=1191709>
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5723617717387264
<https://chromestatus.com/feature/5723617717387264>
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