Intent to Experiment: Speculation rules: form_submission field

[Chromestatus]

Contact emails

robe...@chromium.org

Explainer

https://github.com/WICG/nav-speculation/blob/main/prerendering-form-submission.md

Specification

https://storage.googleapis.com/spec-previews/WICG/nav-speculation/pull/426/diff/prerendering.html

Design docs

https://docs.google.com/document/d/13Xr_kSYZtvhRNaKpCiP7wLKYtDcpLdDWSH4y6gHq0kQ/edit?usp=sharing

Summary

This extends speculation rules syntax to allow developers to specify the form_submission field for prerender. This field directs the browser to prepare the prerender as a form submission, so that it can be activated by real form submission navigations. Examples include a simple search form which results in a /search?q=XXX GET request navigation, support of which has been requested by web developers.

Blink component

Internals>Preload>Prerender

Web Feature ID

speculation-rules

TAG review

https://github.com/w3ctag/design-reviews/issues/1192

TAG review status

Issues open

Risks

Interoperability and Compatibility

The entire speculative loading feature is a progressive enhancement, so in general risks are low in this area.

Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1355)

WebKit: No signal (https://github.com/WebKit/standards-positions/issues/614)

Web developers: No signals

Other signals:

Ergonomics

No

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

Goals for experimentation

No information provided

Ongoing technical constraints

No information provided

Debuggability

As well as other speculationrule features, this feature can be viewed on devtools as the source script. Another dedicated field will be added to the panel for easier debugging.

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?

No
Windows, Mac, Linux, ChromeOS, Android. WebView doesn't support speculation rules prerendering because prerendering navigation breaks the lifecycle (e.g., callback sequence) of the WebView.

Is this feature fully tested by web-platform-tests?

Yes

Flag name on about://flags

PrerenderActivationByFormSubmission

Finch feature name

PrerenderActivationByFormSubmission

Requires code in //chrome?

False

Tracking bug

https://issues.chromium.org/issues/346555939

Measurement

Blink.UseCounter.Features https://crrev.com/c/7533307

Estimated milestones

Origin trial desktop first	146
Origin trial desktop last	151
DevTrial on desktop	146
Origin trial Android first	146
Origin trial Android last	151
DevTrial on Android	146

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5074313831120896?gate=5966135017209856

Links to previous Intent discussions

Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/698f0243.2b0a0220.19817b.0194.GAE%40google.com

This intent message was generated by Chrome Platform Status.

[Huanpo Lin]

Not quite sure about why the system is not including Goals for experimentation correctly.

Allow me to include the part manually.

Goals for experimentation

To evaluate how the prerendering form_submission support works on real sites before shipping it by default. We will be evaluating performance, stability, and correctness, and any other feedback the sites have when they use this feature.