LGTM3
On 6/25/26 4:19 p.m., Chris Harrelson wrote:
LGTM2
On Thu, Jun 25, 2026 at 12:40 AM Yoav Weiss (@Shopify)
<[email protected]> wrote:
On Wednesday, June 24, 2026 at 2:30:12 PM UTC+3 Yoav Weiss wrote:
*Contact emails*
[email protected]
*Explainer*
Navigation-Timing and cross-origin redirects currently have
issues related to both interoperability and missing functionality.
`redirectCount`, `redirectStart` and `redirectEnd` are not
currently exposed in Chromium for navigation responses where
the redirect chain included cross-origin redirects. This is
different from WebKit that exposes them when
`Timing-Allow-Origin` is included in all responses in the chain.
This feature changes that behavior and exposes these
attributes when the Timing-Allow-Origin opt-in is either '*'
or explicitly opts in to the destination navigation origin.
That would enable developers to optimize cross-origin
redirects that are under their control, or report issues to 3P
redirect providers, assuming those providers opt-in to such
reporting, presumably due to to the non-sensitive nature of
their redirects.
*Specification*
https://github.com/whatwg/fetch/pull/1931
<https://github.com/whatwg/fetch/pull/1931>
The relevant Fetch and HTML PRs have now landed.
*Summary*
Currently developers have no way to measure cross-origin
redirects for navigations, even ones under their control, or
ones that choose to opt-in to be measured. This feature
enables servers to opt-in to have their redirects measured by
the destination origin of the navigation.
*Blink component*
Blink>PerformanceAPIs>NavigationTiming
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EPerformanceAPIs%3ENavigationTiming%22>
*Web Feature ID*
Missing feature
This behavior change seems relatively minor so I have filed
for a feature ID. Let me know if you disagree.
*Motivation*
Enables developers to measure and optimize their cross-origin
redirects, while ensuring that opt-in are secure and aligned
with the developer's intention.
*Initial public proposal*
https://github.com/w3c/navigation-timing/issues/215
<https://github.com/w3c/navigation-timing/issues/215>
*TAG review*
No TAG review as this is a minor behavior change for an
existing feature. The change was discussed in the relevant WG.
Let me know if you think a TAG review is needed.
*TAG review status*
Not applicable
*Goals for experimentation*
None
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/: No signal
It's unclear if this is significant enough for a position
request. I pinged the relevant Mozilla folks.
/WebKit/:
Positive
(https://github.com/whatwg/fetch/pull/1931#pullrequestreview-4560631006
<https://github.com/whatwg/fetch/pull/1931#pullrequestreview-4560631006>)
No position filed as this is a minor behavior change. WebKit
are explicitly supportive for WHATWG process purposes.
/Web developers/:
Positive
(https://w3c.github.io/web-performance/meetings/2026/2026-06-04/index.html
<https://w3c.github.io/web-performance/meetings/2026/2026-06-04/index.html>)
This was discussed at the WebPerfWG, and folks were
supportive. Developers at Shopify are highly supportive of
being able to measure and optimize redirects.
/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?
/No information provided/
*Debuggability*
/No information provided/
*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
https://github.com/web-platform-tests/wpt/pull/60823
<https://github.com/web-platform-tests/wpt/pull/60823>
*Flag name on about://flags*
/No information provided/
*Finch feature name*
NavigationTimingRedirectTimingViaTAO
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/521861828
<https://issues.chromium.org/issues/521861828>
*Estimated milestones*
Shipping on desktop151Shipping on Android151Shipping on WebView151
*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).
/No information provided/
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5078310347472896?gate=6080757828288512
<https://chromestatus.com/feature/5078310347472896?gate=6080757828288512>
*Links to previous Intent discussions*
Intent to Prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohS%2BmvvuuG%3D0Jww9xDpDZVsgn90p-VHUjX-exx2SnU8Zf%3Dg%40mail.gmail.com
<https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohS%2BmvvuuG%3D0Jww9xDpDZVsgn90p-VHUjX-exx2SnU8Zf%3Dg%40mail.gmail.com>
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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