Apologies - this intent didn't show up in our review tooling (cc Jason),
so it's slipped under the radar.
I believe y'all have met the bar to extend again, given that the below
criteria are largely done:
Draft spec
TAG review
bit.ly/blink-signals requests
Outreach for feedback from the spec community (maybe except this one?)
WPT tests
LGTM to extend from 119 to 120 inclusive.
On 10/25/23 11:19 AM, Liviu Tinta wrote:
Following up on this intent. Is there anything else needed from a
process perspective to extend the experiment ?
On Monday, October 2, 2023 at 6:31:39 PM UTC-4 blink-dev wrote:
Contact emails
dome...@chromium.org, jbro...@chromium.org
<mailto:jbro...@chromium.org>, liviuti...@chromium.org
<mailto:liviuti...@chromium.org>
Original I2E
https://groups.google.com/a/chromium.org/g/blink-dev/c/6gsc52WQgrU/m/qcTayjt6DAAJ
<https://groups.google.com/a/chromium.org/g/blink-dev/c/6gsc52WQgrU/m/qcTayjt6DAAJ>
Previous Intent to Extend Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/ZQzL4l78NOU/m/DnYxcTWuAAAJ
<https://groups.google.com/a/chromium.org/g/blink-dev/c/ZQzL4l78NOU/m/DnYxcTWuAAAJ>
No-Vary-Search Spec
https://wicg.github.io/nav-speculation/no-vary-search.html
<https://wicg.github.io/nav-speculation/no-vary-search.html>
No-Vary-Search hint explainer
https://github.com/WICG/nav-speculation/blob/main/triggers.md#no-vary-search-hint
<https://github.com/WICG/nav-speculation/blob/main/triggers.md#no-vary-search-hint>
No-Vary-Search hint spec
https://wicg.github.io/nav-speculation/speculation-rules.html#speculation-rules-processing
<https://wicg.github.io/nav-speculation/speculation-rules.html#speculation-rules-processing>
Origin Trial
https://developer.chrome.com/origintrials/#/view_trial/4146689356901384193
<https://developer.chrome.com/origintrials/#/view_trial/4146689356901384193>
Summary
We propose extending the "No-Vary-Search support in navigation
prefetch cache" origin trial. We decided to extend the experiment
based on positive feedback from the developer experimenting with
the No-Vary-Search header and No-Vary-Search hint. (see
ChromeStatus entry:
https://chromestatus.com/feature/4887338302308352
<https://chromestatus.com/feature/4887338302308352>).
We are planning to extend the experiment for 2 more milestones
M119 to M120 inclusive.
Blink component
Internals>Preload
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EPreload>
Motivation
The developer we are working with would like to experiment more
with No-Vary-Search hint in the context of No-Vary-Search header
to evaluate the added impact of the new functionality.
TAG review
https://github.com/w3ctag/design-reviews/issues/797
<https://github.com/w3ctag/design-reviews/issues/797>
TAG review status
Complete at this time. TAG didn't see any major issue and
encouraged us to continue experimenting.
Risks
Interoperability and Compatibility
Gecko: No signal. Request for Standards
Position:https://github.com/mozilla/standards-positions/issues/717
<https://github.com/mozilla/standards-positions/issues/717>.
WebKit: No signal. Informal positive signals from individual
engineers at TPAC 2022. Request for Standards
Position:https://github.com/WebKit/standards-positions/issues/106
<https://github.com/WebKit/standards-positions/issues/106>.
Web developers: Google Search has been experimenting with
No-Vary-Search header / Speculation Rules
"expects_no_vary_search". This functionality helps Google Search
to match prefetched content to the next user navigation.
Developers can use parameters in the prefetched URL that are not
needed when navigating to the actual link (e.g. the source of the
link click). The server can customize behavior using these
parameters without causing a cache miss in the browser.
"expects_no_vary_search" addition to Speculation Rules allows the
browser to completely handle the case where the user navigates to
a URL that is currently prefetched by waiting for the ongoing
prefetch instead of directly requesting the page from the server.
Google Search conducted experiments prefetching Search results
pages from the search box and other links that lead to another
Search results page. There was significant latency improvement for
navigating to Search result pages prefetched using No-Vary-Search
header and "expects_no_vary_search".
"expects_no_vary_search" functionality of Speculation Rules wasn't
available until M116, and even after that it was only available to
a small percentage of the population because of cautious roll-out
of a feature that "expects_no_vary_search" depended on.
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. This is a new opt-in feature.
Debuggability
The preloading panel shows all ongoing preloads, including both
the targeted URL and the cached URL, if they differ due to
No-Vary-Search.
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>?
Yes. WPTs landed under the
external/wpt/speculation-rules/prefetch/no-vary-search folder.
Tracking bug
crbug.com/1378075 <http://crbug.com/1378075>
crbug.com/1416659 <http://crbug.com/1416659>
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5071247189213184
<https://chromestatus.com/feature/5071247189213184>
https://chromestatus.com/feature/4887338302308352
<https://chromestatus.com/feature/4887338302308352>
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