Re: [csswg-drafts] [css-values-3] Restrict none/auto/normal from <custom-ident> (#7431)

I gathered some compatibility data on this using [Cluster Telemetry](https://sites.google.com/a/chromium.org/dev/developers/cluster-telemetry), specifically [with trace counters](https://docs.google.com/document/d/1vGd7dnrxayMYHPO72wWkwTvjMnIRrel4yxzCr1bMiis/edit) using [this patch](https://chromium-review.googlesource.com/c/chromium/src/+/3735845/2).  I also included `default` as well because there's [an existing Chromium bug](https://bugs.chromium.org/p/chromium/issues/detail?id=882285) on fixing Chromium to include `default`.

I ran through a pageset of 10K pages (generally the homepages of sites, and cached rather than live pages) with the custom ident parsing function in Chromium's CSS parser instrumented.  This detected the following pages as being affected by changes to the set of allowed values in `<custom-ident>`, for the set of features supported by Chromium's CSS parser:

`normal`:
no pages found

`none`:
```
1.0,http://www.inc.com (#1243)
2.0,http://www.ebscohost.com (#5605)
1.0,http://www.lopezdoriga.com (#9061)
1.0,http://www.buzzfeednews.com (#9439)
4.0,http://www.bonappetit.com (#9508)
```

`auto`:
```
1.0,http://www.madhyamam.com (#2013)
3.0,http://www.freebitco.in (#2386)
1.0,http://www.chrono24.com (#3635)
3.0,http://www.coin-farm.net (#3768)
1.0,http://www.reactnative.dev (#4956)
3.0,http://www.hcaptcha.com (#5387)
3.0,http://www.dhlexpress.fr (#6459)
3.0,http://www.bestchange.com (#7807)
3.0,http://www.coin-birds.com (#8023)
3.0,http://www.mobox.io (#8435)
3.0,http://yad2.co.il (#8959)
```

`default`:
```
1.0,http://www.elster.de (#7992)
```

I have not attempted to look at any of the pages.  (I could also do a re-run against live pages if it turns out the cached ones are meaningfully out-of-date.)

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Received on Wednesday, 29 June 2022 18:53:44 UTC