Yoav Weiss (@Shopify) (Gerrit)

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Jun 23, 2026, 9:34:57 AM (10 days ago) Jun 23

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Line 12, Patchset 5:navigation params.

Hiroki Nakagawa . resolved

Sorry if I'm missing... but did we already support the case where a link-preconnect is specified on the final response (not 103 responses)?

Yoav Weiss (@Shopify)

Great point! I missed the fact that top-level preconnects happen outside the renderer. I'll add support for that as well.

Yoav Weiss (@Shopify)

Added support for both, and changed the commit message.

File third_party/blink/web_tests/external/wpt/speculation-rules/speculation-measurement/performance-speculations-early-hints-preconnect.tentative.h2.window.js

Line 25, Patchset 5:});

Hiroki Nakagawa . resolved

(Not blocking this CL) Would it be possible to test the case where multiple 103 early hints responses are served?

Yoav Weiss (@Shopify)

Done

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Yoav Weiss (@Shopify) (Gerrit)

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Jun 23, 2026, 12:04:57 PM (10 days ago) Jun 23

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File-level comment, Patchset 8 (Latest):

Yoav Weiss (@Shopify) . resolved

nhiroki@ - can you take a second look? I added the navigation non-early-hint preconnects

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Yoav Weiss (@Shopify) (Gerrit)

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Jun 23, 2026, 2:44:45 PM (10 days ago) Jun 23

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Hiroki Nakagawa . resolved

LGTM, thanks!

File third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html

Line 10, Patchset 8 (Latest):

// The browser only honors the first Early Hints response, so only the first
// origin's preconnect should be recorded.

Hiroki Nakagawa . unresolved

QQ: Is this spec'ed behavior? Or, is this Chromium-specific behavior?

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Mike West (Gerrit)

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ipc lgtm.

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Yoav Weiss (@Shopify) (Gerrit)

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Jun 24, 2026, 2:48:49 AM (9 days ago) Jun 24

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File third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html

Line 10, Patchset 8 (Latest):

// The browser only honors the first Early Hints response, so only the first
// origin's preconnect should be recorded.

Hiroki Nakagawa . unresolved

QQ: Is this spec'ed behavior? Or, is this Chromium-specific behavior?

Yoav Weiss (@Shopify)

I don't think this is specified, tbh. I can add a comment to that effect.

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Yoav Weiss (@Shopify) (Gerrit)

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Jun 24, 2026, 3:01:56 AM (9 days ago) Jun 24

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File third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html

Line 10, Patchset 8 (Latest):

// The browser only honors the first Early Hints response, so only the first
// origin's preconnect should be recorded.

Hiroki Nakagawa . unresolved

QQ: Is this spec'ed behavior? Or, is this Chromium-specific behavior?

Yoav Weiss (@Shopify)

I don't think this is specified, tbh. I can add a comment to that effect.

Yoav Weiss (@Shopify)

I was wrong, and this goes against the specified behavior.. So it could just be a Chromium bug

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Yoav Weiss (@Shopify) (Gerrit)

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Jun 24, 2026, 3:02:48 AM (9 days ago) Jun 24

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File third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html

Line 10, Patchset 8 (Latest):

// The browser only honors the first Early Hints response, so only the first
// origin's preconnect should be recorded.

Hiroki Nakagawa . unresolved

QQ: Is this spec'ed behavior? Or, is this Chromium-specific behavior?

Yoav Weiss (@Shopify)

I don't think this is specified, tbh. I can add a comment to that effect.

Yoav Weiss (@Shopify)

I was wrong, and this goes against the specified behavior.. So it could just be a Chromium bug

Yoav Weiss (@Shopify)

I'll add a TODO. Since this is all tentative tests, this is probably fine for now

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Yoav Weiss (@Shopify) (Gerrit)

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Jun 24, 2026, 3:18:54 AM (9 days ago) Jun 24

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File third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html

Line 10, Patchset 8:// The browser only honors the first Early Hints response, so only the first


// origin's preconnect should be recorded.

Hiroki Nakagawa . resolved

QQ: Is this spec'ed behavior? Or, is this Chromium-specific behavior?

Yoav Weiss (@Shopify)

I don't think this is specified, tbh. I can add a comment to that effect.

Yoav Weiss (@Shopify)

I was wrong, and this goes against the specified behavior.. So it could just be a Chromium bug

Yoav Weiss (@Shopify)

I'll add a TODO. Since this is all tentative tests, this is probably fine for now

Yoav Weiss (@Shopify)

Added a TODO and opened https://issues.chromium.org/issues/527144295 to further look into this.

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File-level comment, Patchset 9 (Latest):

Yoav Weiss (@Shopify) . resolved

Thanks all for promptly reviewing!!

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File third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html

Line 10, Patchset 8:

// The browser only honors the first Early Hints response, so only the first
// origin's preconnect should be recorded.

Hiroki Nakagawa . resolved

QQ: Is this spec'ed behavior? Or, is this Chromium-specific behavior?

Yoav Weiss (@Shopify)

I don't think this is specified, tbh. I can add a comment to that effect.

Yoav Weiss (@Shopify)

I was wrong, and this goes against the specified behavior.. So it could just be a Chromium bug

Yoav Weiss (@Shopify)

I'll add a TODO. Since this is all tentative tests, this is probably fine for now

Yoav Weiss (@Shopify)

Added a TODO and opened https://issues.chromium.org/issues/527144295 to further look into this.

Hiroki Nakagawa

Acked, thank you!

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Change information

Commit message:

SpeculationMeasurement - browser-side preconnects

This CL adds the browser-side of preconnect measurement.
It does so by following similar patterns to preload reporting, as it
passes a list of navigation and early-hint preconnects to the renderer
as part of its navigation params.

Change-Id: I205f3a02b72e95ecc721da9a7dea26623d2b70ce

Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7976017

Reviewed-by: Mike West <mk...@chromium.org>

Reviewed-by: Hiroki Nakagawa <nhi...@chromium.org>

Reviewed-by: Rakina Zata Amni <rak...@chromium.org>

Commit-Queue: Yoav Weiss (@Shopify) <yoav...@chromium.org>

Cr-Commit-Position: refs/heads/main@{#1651563}

Files:

M content/browser/loader/navigation_early_hints_manager.cc
M content/browser/loader/navigation_early_hints_manager.h
M content/browser/renderer_host/navigation_controller_impl.cc
M content/browser/renderer_host/navigation_entry_impl.cc
M content/browser/renderer_host/navigation_request.cc
M content/renderer/render_frame_impl.cc
M third_party/blink/public/mojom/navigation/navigation_params.mojom
M third_party/blink/public/web/web_navigation_params.h
M third_party/blink/renderer/core/loader/document_loader.cc
M third_party/blink/renderer/core/loader/document_loader.h
M third_party/blink/renderer/core/loader/frame_fetch_context.cc
M third_party/blink/renderer/platform/loader/BUILD.gn
A third_party/blink/renderer/platform/loader/fetch/cross_origin_attribute_value.cc
M third_party/blink/renderer/platform/loader/fetch/cross_origin_attribute_value.h
M third_party/blink/renderer/platform/loader/fetch/resource_fetcher.cc
M third_party/blink/web_tests/external/wpt/loading/early-hints/resources/early-hints-helpers.sub.js
M third_party/blink/web_tests/external/wpt/loading/early-hints/resources/early-hints-test-loader.h2.py
A third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.h2.py
A third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html
A third_party/blink/web_tests/external/wpt/loading/early-hints/resources/speculation-measurement-early-hints-preconnect.html
A third_party/blink/web_tests/external/wpt/speculation-rules/speculation-measurement/performance-speculations-early-hints-preconnect.tentative.h2.window.js
A third_party/blink/web_tests/external/wpt/speculation-rules/speculation-measurement/performance-speculations-multiple-early-hints-preconnect.tentative.h2.window.js
A third_party/blink/web_tests/external/wpt/speculation-rules/speculation-measurement/performance-speculations-preconnect-response-header.tentative.html
A third_party/blink/web_tests/external/wpt/speculation-rules/speculation-measurement/performance-speculations-preconnect-response-header.tentative.html.headers

Change size: L

Delta: 24 files changed, 392 insertions(+), 12 deletions(-)

Branch: refs/heads/main

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The WPT PR for this CL has been merged upstream! https://github.com/web-platform-tests/wpt/pull/60854

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Kenichi Ishibashi (Gerrit)

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Jun 24, 2026, 9:20:38 PM (9 days ago) Jun 24

to Chromium LUCI CQ, Yoav Weiss (@Shopify), Blink W3C Test Autoroller, Mike West, Hiroki Nakagawa, Chromium IPC Reviews, Rakina Zata Amni, android-bu...@system.gserviceaccount.com, chromium...@chromium.org, Nate Chapin, loading-re...@chromium.org, alexmo...@chromium.org, blink-re...@chromium.org, blink-revie...@chromium.org, blink-...@chromium.org, creis...@chromium.org, gavinp...@chromium.org, ipc-securi...@chromium.org, kinuko...@chromium.org, loading...@chromium.org, navigation...@chromium.org

Kenichi Ishibashi added 1 comment

File third_party/blink/web_tests/external/wpt/loading/early-hints/resources/multiple-early-hints-preconnects.html

Line 10, Patchset 8:

// The browser only honors the first Early Hints response, so only the first
// origin's preconnect should be recorded.

Hiroki Nakagawa . resolved

QQ: Is this spec'ed behavior? Or, is this Chromium-specific behavior?

Yoav Weiss (@Shopify)

I don't think this is specified, tbh. I can add a comment to that effect.

Yoav Weiss (@Shopify)

I was wrong, and this goes against the specified behavior.. So it could just be a Chromium bug

Yoav Weiss (@Shopify)

I'll add a TODO. Since this is all tentative tests, this is probably fine for now

Yoav Weiss (@Shopify)

Added a TODO and opened https://issues.chromium.org/issues/527144295 to further look into this.

Hiroki Nakagawa

Acked, thank you!

Kenichi Ishibashi

IIUC this is a spec specified behavior at least when I implemented Early Hints for prefetch.

https://source.chromium.org/chromium/chromium/src/+/main:content/browser/loader/navigation_early_hints_manager.cc;l=409;drc=fc84d1f619f67f5bbd2244f2df6e6814d000143b

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SpeculationMeasurement - browser-side preconnects [chromium/src : main]

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