This seems like a good thing to do, thanks! What are the requested timelines for the deprecation trial?
On Tuesday, January 25, 2022 at 3:40:15 PM UTC+1 Ali Beyad wrote: > Contact emails > > abe...@chromium.org, victor...@chromium.org, jadekess...@chromium.org, > miketa...@chromium.org > > Explainer > > None > > Specification > > None > > Summary > > Before we proceed with User-Agent (UA) reduction, we want to allow sites > that are not yet ready for the reduced UA string to get the full UA string, > exposed > in HTTP requests and in navigator.userAgent, navigator.appVersion, and > navigator.platform, through a deprecation origin trial. > > Design Doc > > > https://docs.google.com/document/d/1d-K43rzfDGxNM4H6Yzh5lV08KJwLsae06i4Q0A8snME > > Blink component > > Privacy>Fingerprinting > <https://bugs.chromium.org/p/chromium/issues/list?q=component:Privacy%3EFingerprinting> > > TAG review > > https://github.com/w3ctag/design-reviews/issues/640 > > TAG review status > > TBD, but we have positive signals > <https://github.com/w3ctag/design-reviews/issues/640#issuecomment-992698367> > thus far. > > Risks > Interoperability and Compatibility > > The compatibility risk is low, as we’re planning to send the full UA > string in the deprecation origin trial, which is an existing behavior > before UA reduction that sites already know how to parse. The deprecation > origin trial is there simply to allow sites that aren’t yet prepared for > the new behavior (the reduced UA string) to continue to receive the old > behavior (the full UA string) for some time period. > > As for interoperability, the concern is again low because the deprecation > origin trial is simply enabling previously-existing behavior to continue to > operate for the sites that are enrolled. > > Experiment Summary > > The prerequisite of this trial is that developers know the deprecation > origin trial is a temporary measure to allow more time to migrate off of > the full UA string, and move to using User-Agent Client Hints (UA-CH) > instead. By the end of the deprecation origin trial date, the Chrome > browser will exclusively send the reduced UA string. > > The goal is to enable developers to ensure stability with our proposed > changes. > > As for engaging with the trial itself, there will be two components > controlled by the same origin trial: > > 1. > > Provide the full UA string in the associated Javascript APIs, if the > deprecation origin trial is enabled. > 2. > > A client hint that gets set when the deprecation origin trial is > enabled, where the client hint indicates to the origin that the User-Agent > request header contains the full user agent value. Because of the > experimental nature of this client hint, a valid origin trial token must > be > sent in the response header by the origin for the client hint to take > effect or be stored (in order to prevent platform burn-in for this > temporary client hint). > > > During the process of conducting the origin trial, we may find that we > need to request an exception to the per-site (and possibly global) limits > imposed by origin trials. In practice, origin trials rarely exceed their > quota limits, but if necessary, there is time between when the limits have > been exceeded and the origin trial is turned off, where we can work with > the users on reducing their usage and/or lifting the limits. > > Please see the design document describing the experiment for more > information. > > Experiment Goals > > The goal of this trial is to enable developers more time to migrate away > from the full UA string and move towards adoption of UA-CH. Beginning in > M101, we plan to send the reduced UA string in a phased rollout > <https://blog.chromium.org/2021/09/user-agent-reduction-origin-trial-and-dates.html> > > approach. For those sites that haven’t been able to migrate their > dependencies on the full UA string, the deprecation trial affords them more > time to do so. > > We will be relying heavily on user and developer feedback to identify > where breakage occurs. We request feedback to be provided in our GitHub > repository https://github.com/abeyad/user-agent-reduction. When the > deprecation origin trial is ready, we plan to publish developer guidance on > how to enroll and provide feedback in the form of a blog post. > > Experiment Risks > > As the proposed changes are existing behavior, the experiment risks are > low. Site breakage can take many forms, both obvious and non-obvious. > However, since sites are in control of the Origin-Trial and Accept-CH > headers, a site can quickly opt out of the experiment when breakage is > encountered. > > Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> > ? > > No. > > Flag name > > #full-user-agent > > Launch bug > > https://bugs.chromium.org/p/chromium/issues/detail?id=1232573 (for UA > reduction) > > Tracking bug > > https://bugs.chromium.org/p/chromium/issues/detail?id=1282230 > > Link to entry on the Chrome Platform Status > > https://chromestatus.com/feature/5704553745874944 > > Links to previous Intent discussions > > I2E for UserAgentReduction: > https://groups.google.com/a/chromium.org/g/blink-dev/c/R0xKm1B7qoQ/ > > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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