On 5/20/25 10:07 PM, Domenic Denicola wrote:
(Feature-collaborator hat on, API owners hat off.)
Thanks for sending this! A few minor corrections here, that it'd be
good to make to the ChromeStatus entry.
On Wed, May 21, 2025 at 10:42 AM Chromestatus
<ad...@cr-status.appspotmail.com> wrote:
Contact emails
steven...@microsoft.com
Explainer
https://github.com/WICG/nav-speculation/blob/main/clear-site-data-integration.md
Specification
https://chromium-review.googlesource.com/c/chromium/src/+/6456388
This is not a specification, but instead a Chromium CL. You can link
to
https://wicg.github.io/nav-speculation/prefetch.html#clear-site-data-patches
and
https://wicg.github.io/nav-speculation/prerendering.html#interaction-with-clear-site-data
for the specification.
Thanks for linking these, Domenic.
Has there been any discussion with WebAppSec about future integration
with the clear-site-data spec? I tried to find an issue or agenda topic,
but didn't come up with anything.
Summary
We propose adding two new values to the Clear-Site-Data header to
help developers target clearing the prerender and prefetch cache:
“prefetchCache” and “prerenderCache”.
Blink component
Blink>Loader>Preload
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ELoader%3EPreload%22>
TAG review
https://github.com/w3ctag/design-reviews/issues/1091
TAG review status
Pending
Risks
Interoperability and Compatibility
None
/Gecko/: Positive
(https://github.com/mozilla/standards-positions/issues/1214)
/WebKit/: No signal
(https://github.com/WebKit/standards-positions/issues/488)
/Web developers/: No signals
We have positive signals from engineers at Shopify at
https://github.com/WICG/nav-speculation/issues/357#issuecomment-2766677746
, as well as a separate engineer (/using/ Shopify) at
https://github.com/WICG/nav-speculation/issues/352 .
/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
It's good to explain the reason here. The reason is that speculation
rules prefetch and prerender is not yet supported on Android WebView.
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
Adding tests.
I think you already added the tests in
https://chromium-review.googlesource.com/c/chromium/src/+/6456388 ,
and they're now visible at
https://wpt.fyi/results/speculation-rules?label=master&label=experimental&aligned&q=clear-site-data
<https://wpt.fyi/results/speculation-rules?label=master&label=experimental&aligned&q=clear-site-data>
.
Flag name on about://flags
ClearSiteDataPrefetchPrerenderCache
This is actually the Finch feature name. We don't have any flag name
on about://flags.
Finch feature name
None
Non-finch justification
None
Rollout plan
Will ship enabled for all users
Requires code in //chrome?
False
Tracking bug
https://issues.chromium.org/issues/398149359
Estimated milestones
No milestones specified
I think we're targeting 138.
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/4755745652080640?gate=5143125462614016
Links to previous Intent discussions
Intent to Prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/680bb74f.170a0220.15e62e.053b.GAE%40google.com
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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