Although the utility of this specific bit does seem questionable, I'm 100% in agreement that having a 1:1 mapping to UA string is a critical property and should lower both the perceived and real risk of UA reduction efforts. So emphatic LGTM2 from me.
On Wed, Jan 26, 2022 at 10:23 AM Yoav Weiss <yoavwe...@chromium.org> wrote: > Wow, LGTM1 > > This is a tiny addition to UA Client Hints, that will enable 1:1 > retrofilling <https://github.com/GoogleChromeLabs/uach-retrofill>. > > On Tuesday, January 25, 2022 at 3:11:32 PM UTC+1 Mike Taylor wrote: > >> Contact emails >> miketa...@chromium.org, jadekess...@chromium.org >> >> Explainer >> >> https://github.com/WICG/ua-client-hints#explainer-reducing-user-agent-granularity >> >> Specification >> https://wicg.github.io/ua-client-hints/#sec-ch-ua-wow64 >> >> Summary >> The Sec-CH-UA-WoW64 Client Hint is a backwards compatible shim for sites >> relying on "WoW64-ness" (32-bit app running in 64-bit Windows) as they >> transition from the User-Agent string to UA-CH. It returns a boolean value. >> >> >> Blink component >> Blink>Network>ClientHints >> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ENetwork%3EClientHints> >> >> Motivation >> We would like to provide a seamless transition from User-Agent-based use >> cases to UA-CH. The "WoW64" bit is the last missing piece to accomplish >> this goal. >> >> >> Initial public proposal >> https://github.com/WICG/ua-client-hints/issues/217 >> >> Search tags >> wow, wow64, ua-ch, uach >> >> TAG review >> https://github.com/w3ctag/design-reviews/issues/640 - still open, but >> issues have been addressed. I'll ping the existing issue with this addition >> so folks are aware, but I don't expect it to change TAG's stance of UA-CH >> as a feature. >> >> TAG review status >> Issues addressed >> >> Risks >> We don’t anticipate any risk here, we’re just moving this bit from one >> API to another as a shim. >> >> Interoperability and Compatibility >> Interop: Not all browsers expose wow64-ness in the UA string today, so >> sites should not treat a false value as meaningful (the spec allows for >> always returning false). >> >> Compat: This hint can be thought of as a compatibility shim for sites >> migrating from User-Agent to UA-CH, otherwise N/A. >> >> Gecko: Non-harmful on UA-CH, but were they to implement UA-CH I would not >> expect them to add this hint (as they don’t expose this bit in their UA >> string anymore). >> >> WebKit: No signal. I would also not expect Apple to implement this one, >> were they to implmement UA-CH. >> >> Web developers: Mixed signals ( >> https://github.com/WICG/ua-client-hints/issues/217) We know of at least >> one site (Meet) that uses wow64 to prevent sending a 7MB wasm binary to >> users were performance is known to be lousy . >> >> Debuggability >> Nothing special needed. >> >> >> Is this feature fully tested by web-platform-tests? >> We'll add some. >> >> Flag name >> None. >> >> Requires code in //chrome? >> False >> >> Estimated milestones >> M100 >> >> Tracking Bug >> https://bugs.chromium.org/p/chromium/issues/detail?id=1288837 >> >> >> Link to entry on the Chrome Platform Status >> https://chromestatus.com/feature/5682026601512960 >> >> -- > 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/819ac730-e4f3-44cb-a2f2-1154de41ed6bn%40chromium.org > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/819ac730-e4f3-44cb-a2f2-1154de41ed6bn%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/CAFUtAY_q8v5Uyv-LNg-6183b3cMQmsDkKqVmHAXbuouFWLu-4w%40mail.gmail.com.
