LGTM to extend from 119 to 120 (inclusive).
On 9/11/23 12:45 PM, Domenic Denicola wrote:
Contact emails
[email protected] <mailto:[email protected]>,
[email protected] <mailto:[email protected]>,
[email protected] <mailto:[email protected]>
Explainer
https://github.com/WICG/nav-speculation/blob/main/triggers.md#document-rules
<https://github.com/WICG/nav-speculation/blob/main/triggers.md#document-rules>
Specification
https://wicg.github.io/nav-speculation/speculation-rules.html
<https://wicg.github.io/nav-speculation/speculation-rules.html>
Summary
Two enhancements to speculation rules-based speculative loading, under
a combined experiment:
An extension to speculation rules syntax that lets the browser obtain
URLs for speculation from link elements in a page. They may include
criteria which restrict which of these links can be used.
Currently developers can only specify speculation rules using inline
script tags. The proposed feature provides an alternative through the
"Speculation-Rules" header. Its value must be a URL to a text resource
with "application/speculationrules+json" MIME type. The resource's
rules will be added to the document's rule set.
Blink component
Internals>Preload
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EPreload>
TAG review
https://github.com/w3ctag/design-reviews/issues/721
<https://github.com/w3ctag/design-reviews/issues/721>
TAG review status
Complete at this time. TAG has reservations about whether the use
cases of this feature justify its complexity, as compared to a simpler
solution which would address some but not all of the use cases.
Chromium Trial Name
SpeculationRulesPrefetchFuture
Link to origin trial feedback summary
https://docs.google.com/document/d/13cJcoygFD64UcQH-P30dXCLbdD6SXpQwhpOUym64KXw/edit?usp=sharing
<https://docs.google.com/document/d/13cJcoygFD64UcQH-P30dXCLbdD6SXpQwhpOUym64KXw/edit?usp=sharing>
Origin Trial documentation link
https://github.com/WICG/nav-speculation/blob/main/chrome-2023q1-experiment-overview.md
<https://github.com/WICG/nav-speculation/blob/main/chrome-2023q1-experiment-overview.md>
WebFeature UseCounter name
SpeculationRulesDocumentRules
Risks
Interoperability and Compatibility
Because authors cannot rely on document rules being evaluated (or
preloading generally), applications which use them should function
correctly in other browsers and should continue to function correctly
were the feature to be deprecated. Of course, ideally other browsers
do find it compelling to implement this feature.
Gecko: No signal
(https://github.com/mozilla/standards-positions/issues/620
<https://github.com/mozilla/standards-positions/issues/620>)
WebKit: No signal
(https://github.com/WebKit/standards-positions/issues/54
<https://github.com/WebKit/standards-positions/issues/54>)
Web developers: Strongly positive on document rules from various
sources; recent positive feedback from one partner on the response
header. See origin trial feedback summary for more details.
Activation
Some developers might not be immediately aware of which URLs they can
prefetch or prerender without side effects; this risk is reduced if
they primarily use the feature for same-origin URL patterns they are
familiar with.
Security
Seehttps://wicg.github.io/nav-speculation/speculation-rules.html#security-considerations
<https://wicg.github.io/nav-speculation/speculation-rules.html#security-considerations>.
WebView application risks
None that are specifically anticipated.
Reason this experiment is being extended
Document rules have proven a lot of value. However, we have a few
minor breaking changes we'd like to make over the next couple of
milestones before shipping them unrestricted.
The response header-based delivery of speculation rules has only
recently started being used, as the partner which originally requested
it shifted priorities. Now that experimentation with it has begun in
earnest, we'd like to give it a few milestones of testing before
sending an Intent to Ship.
Ongoing technical constraints
At this time the constraints are believed to be minimal.
Debuggability
Speculative loading which occurs is visible in the Network panel and
the new Preloading panel. Console warnings are logged when several
types of issues are encountered.
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, Chrome OS, 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
Finch feature name
SpeculationRulesPrefetchFuture
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1371522
<https://bugs.chromium.org/p/chromium/issues/detail?id=1371522>
https://bugs.chromium.org/p/chromium/issues/detail?id=1366940
Estimated milestones
110-120 (inclusive) on all Chrome platform
if extension for milestones 119-120 (inclusive) is granted
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5112150536749056
<https://chromestatus.com/feature/5112150536749056>
https://chromestatus.com/feature/5069400512659456
Links to previous Intent discussions
Intent to Prototype: Document Rules
<https://groups.google.com/a/chromium.org/g/blink-dev/c/N0psmOztjM0/m/NWdkirDSAQAJ>
Intent to Prototype: Speculation-Rules header
<https://groups.google.com/a/chromium.org/g/blink-dev/c/C3bHhfzf7bY/m/fThW8NnoAwAJ>
Intent to Experiment: Speculation Rules - Document rules, response
header, deliveryType
<https://groups.google.com/a/chromium.org/g/blink-dev/c/3-0rLTZePzc/m/VNHWAdAGDQAJ>
Intent to Extend Experiment: Speculation Rules - Document rules,
response header, deliveryType
<https://groups.google.com/a/chromium.org/g/blink-dev/c/L3mpXE1x3Zk/m/6Lko5dPKAgAJ>
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>and edited by hand.
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