On Tue, Feb 1, 2022 at 11:24 AM Mike Taylor <miketa...@chromium.org> wrote:
> *Contact emails* > > > > * miketa...@chromium.org <miketa...@chromium.org>, abe...@chromium.org > <abe...@chromium.org>, jadekess...@chromium.org <jadekess...@chromium.org> > Explainer > https://github.com/WICG/ua-client-hints#explainer-reducing-user-agent-granularity > <https://github.com/WICG/ua-client-hints#explainer-reducing-user-agent-granularity> > Specification https://www.chromium.org/updates/ua-reduction > <https://www.chromium.org/updates/ua-reduction> is the closest thing that > specifies Chrome’s UA Reduction plans today. As these changes land in > Chromium, the Compat Standard <https://compat.spec.whatwg.org/> will be > updated to reflect them (in the newly landed UA String section > <https://compat.spec.whatwg.org/#ua-string-section>).* > I want to call out that this is some really great work. For years specs have basically said "use an implementation-defined value", but we knew that was not sufficient for web compatibility, and it was not useful to web developers or implementers. Years ago we started to capture some interesting constraints in HTML's definition of navigator compatibility mode <https://html.spec.whatwg.org/#concept-navigator-compatibility-mode>, but we knew there were many more. The work Mike has done has started to address this long-standing issue of spec tech debt, and it's really great that he's put in the extra work here instead of just taking advantage of the spec's historical looseness. I did a quick review on the spec and found some minor issues and clarity improvement suggestions <https://github.com/whatwg/compat/issues/created_by/domenic>, but overall this is a great foundation and gives me confidence others can both follow along with our plans, and implement compatible software based on them. > > > > > > > > > > > > > > > > > > > > > > > > * Summary As previously detailed on the Chromium Blog > <https://blog.chromium.org/2021/09/user-agent-reduction-origin-trial-and-dates.html>, > we intend to proceed with Phase 4 of the User-Agent Reduction plan. In > Phase 4, the MINOR.BUILD.PATCH version numbers are reduced to "0.0.0". For > use cases requiring high-entropy full version information, developers are > encouraged to migrate to the User Agent Client Hints API > <https://web.dev/migrate-to-ua-ch/>, in particular the > Sec-CH-UA-Full-Version-List > <https://wicg.github.io/ua-client-hints/#sec-ch-ua-full-version-list> hint. > Blink component Blink > <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink> TAG > review https://github.com/w3ctag/design-reviews/issues/640 > <https://github.com/w3ctag/design-reviews/issues/640> TAG review status > Issues addressed Risks Interoperability and Compatibility Any time you > modify the User-Agent string there is a risk of some content somewhere > depending on the previous format. There should not be interop risks, as > each browser sends its own User-Agent string. But there is a risk that > content somewhere is relying on “non-zero” MINOR, BUILD, or PATCH > information. My personal view is that the risk is low compared to the rest > of the changes to come in later phases. But in order to mitigate the risk > of this change, we intend to slowly roll it out via Finch and observe > health metrics (i.e., HTTP 4XX and 5XX error codes, etc.) and bug reports > from the community. We've surveyed dozens of User-Agent parsing libraries, > and as far as we know "0.0.0" will not create a problem syntactically. But > the web can get pretty weird in ways we don't anticipate, hence the slow > roll-out and incremental path towards User-Agent Reduction. Gecko: > Shipped/Shipping. Firefox has frozen (or capped) much of their UA string > already. WebKit: Shipped/Shipping. Safari has already frozen everything in > their UA string except for version number info. Web developers: Mixed > signals. Reactions have ranged from positive to indifferent to negative, > from various channels. Debuggability No special DevTools support needed. 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 reduce-user-agent Requires code in //chrome? False Tracking > bug https://bugs.chromium.org/p/chromium/issues/detail?id=1282229 > <https://bugs.chromium.org/p/chromium/issues/detail?id=1282229> Launch bug > https://bugs.chromium.org/p/chromium/issues/detail?id=1282238 > <https://bugs.chromium.org/p/chromium/issues/detail?id=1282238> Estimated > milestones We aim to start rollout in M101. We will update this thread once > the feature is shipping to 100% of the stable population. Link to entry on > the Chrome Platform Status > https://chromestatus.com/feature/6311349754789888 > <https://chromestatus.com/feature/6311349754789888> * > > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to blink-dev+unsubscr...@chromium.org. > To view this discussion on the web visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/05b6cf46-7bce-bd03-8a93-0db496a3a26e%40chromium.org > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/05b6cf46-7bce-bd03-8a93-0db496a3a26e%40chromium.org?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAM0wra_K7OF8TLhuWZXq8ROjb%2Bns2hDbPow%2BhFOFKMhc9pvUHQ%40mail.gmail.com.
