On 12/6/24 5:48 AM, Chromestatus wrote:
Contact emails
ree...@chromium.org
Specification
None
Summary
Report a predictable storage quota from StorageManager's estimate API
for sites that do not have unlimited storage permissions. It is
possible to detect a user's browsing mode via the reported storage
quota because the storage space made available is significantly
smaller in incognito mode than in regular mode. This is a mitigation
that prevents detection of a user's browsing mode via the storage API
by reporting an artificial quota, equal to usage + 10 Gib, in all
browsing modes for sites with limited storage permissions. Sites with
unlimited storage permissions will be unaffected. Enforced quota will
also be unaffected.
A small explainer (or more details) would be useful here, it's not
immediately obvious what changes you're proposing to make. Are we making
this change only to incognito mode, or to regular mode as well? Do we
need to update a spec somewhere, or is this already allowed (pointer to
the relevant spec would be useful)?
Blink component
Blink>Storage>Quota
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink>Storage>Quota>
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
Could you flesh out interop and compat risks here please, i.e. What do
other browsers do? What do we expect to break (or not) as a result? You
mention Incognito mode detection (I'm making an educated guess that
"user's browsing mode" refers to) - have you looked at different use
cases and how they might be impacted? Do we have test coverage?
None
/Gecko/: No signal
/WebKit/: No signal
/Web developers/: No 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?
None
Debuggability
None
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
No
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
Flag name on about://flags
predictable-reported-quota
Finch feature name
StaticStorageQuota
Requires code in //chrome?
False
Tracking bug
https://issues.chromium.org/issues/369865059
Estimated milestones
Shipping on desktop 133
Shipping on Android 133
Shipping on WebView 133
Anticipated spec changes
Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github
issues in the project for the feature specification) whose resolution
may introduce web compat/interop risk (e.g., changing to naming or
structure of the API in a non-backward-compatible way).
None
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/4977371751645184?gate=4955779474653184
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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