Intent to Experiment: Speculative load measurement

[Yoav Weiss (@Shopify)]

Contact emails

yoav...@chromium.org, barryp...@google.com

Explainer

https://github.com/yoavweiss/speculative_load_measurement/blob/main/README.md

Specification

Not yet.

Summary

Expose measurement data regarding speculative loads (preloads, prefetch and prerenders) as part of the "pagehide" event. That would enable developers to measure the efficacy of various speculative loading strategies and adapt them accordingly.

Blink component

Blink>PerformanceAPIs

Web Feature ID

Missing feature

TAG review

Not yet.

TAG review status

Not yet filed.

Goals for experimentation

See that the API shape enables developers to solve real life measurement issues related to speculative loads.

Risks

Interoperability and Compatibility

As a new API surface, there are no real compatibility issues.

As far as interoperability goes, it's a bit early to tell. We haven't asked for positions just yet.

Gecko: No signal yet.

WebKit: No signal yet.

Web developers: Support from Wix and general support at WebPerfWG discussions.

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

Ongoing technical constraints

No

Debuggability

Nothing in particular.

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?

Yes

Flag name on about://flags

No information provided

Finch feature name

SpeculationMeasurement

Non-finch justification

None

Requires code in //chrome?

False

Tracking bug

https://issues.chromium.org/issues/481590676

Estimated milestones

M150-M155 inclusive

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5118840377835520?gate=6004022601449472

Links to previous Intent discussions

Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohSJA9q57gnHFyJ1WqUUJi2AX5UCmtDM50URp9hjx3J4WJg%40mail.gmail.com

This intent message was generated by Chrome Platform Status.

[Yoav Weiss (@Shopify)]

On Tuesday, May 19, 2026 at 5:26:35 PM UTC+2 Yoav Weiss wrote:

Contact emails

yoav...@chromium.org, barrypoll...@google.com

Explainer

https://github.com/yoavweiss/speculative_load_measurement/blob/main/README.md

Specification

Not yet.

Summary

Expose measurement data regarding speculative loads (preloads, prefetch and prerenders) as part of the "pagehide" event. That would enable developers to measure the efficacy of various speculative loading strategies and adapt them accordingly.

A more up-to-date summary would be:
Expose measurement data regarding speculative loads (preloads, prefetches and prerenders) in a newly exposed `performance.getSpeculations()` method. That would enable developers to measure the efficacy of various speculative loading strategies and adapt them accordingly.