> having the ability to kill-switch this with a flag would be advisable

Is that possible? My understanding is that it is not. If it were, then
it would have been gated behind the (never-exposed) flag to begin with.

> Have we done any kind of research to determine that sites weren't
attempting to use this?

Do you mean attempt to use in its intended fashion, or attempt to use it
for browser engine detection? For the former: I think it's impossible
because it never even got to dev trial. For the latter, are there popular
libraries out there we can look at? This one
<https://github.com/isocroft/browsengine> does not use it.

Googling for "navigator.storage.addeventlistener" turns up only the
explainer for the Storage Pressure event. "navigator.storage instanceof
EventTarget" turns up nothing.

-- Evan Stade


On Wed, Oct 30, 2024 at 6:49 PM Mike Taylor <miketa...@chromium.org> wrote:

>
> On 10/30/24 7:54 PM, Chromestatus wrote:
>
> Contact emails est...@chromium.org
>
> Specification https://storage.spec.whatwg.org
>
> Summary
>
> navigator.storage is no longer an EventTarget navigator.storage was made
> an EventTarget for the Storage Pressure Event, which never made it past the
> prototype phase: https://chromestatus.com/feature/5666274359115776 This
> dead code is being removed and as a result, navigator.storage will no
> longer extend EventTarget.
>
>
> Blink component Blink>Storage>Quota
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EStorage%3EQuota>
>
> TAG review None
>
> TAG review status Not applicable
>
> Risks
>
>
> Interoperability and Compatibility
>
> This change is technically web-facing, but it brings Chromium in line with
> other browser vendors. It's very unlikely any site used the functionality
> because Chromium never fired an event at navigator.storage except in
> developer builds.
>
> Bringing us in line with other browsers is good, but not necessarily a
> guarantee that things won't go wrong. Have we done any kind of research to
> determine that sites weren't attempting to use this?
>
> At the very least, having the ability to kill-switch this with a flag
> would be advisable - right now this PSA suggests otherwise.
>
>
>
> *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)? Yes
>
> Is this feature fully tested by web-platform-tests
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
> ? Yes
>
> Flag name on chrome://flags None
>
> Finch feature name None
>
> Non-finch justification None
>
> Requires code in //chrome? False
>
> Estimated milestones
> Shipping on desktop 132
> Shipping on Android 132
>
> 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/5132158480678912?gate=5665876618248192
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com>.
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> .
>
>

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