I've got two updates on the questions:

On Thu, Sep 7, 2023 at 2:46 AM Koji Ishii <ko...@chromium.org> wrote:

> Good point, thanks for asking.
>
> Technically speaking, we can't write any tests because the
> language-specific content analysis is UA defined. Tests use common and easy
> words that most engines would analyze the same way, but you're right that
> we may need to modify tests if any engine analyzes them differently.
>
> Tests contain that in comments, like this
> <https://github.com/web-platform-tests/wpt/blob/master/css/css-text/word-break/auto-phrase/word-break-auto-phrase-001.html>
> or this
> <https://github.com/web-platform-tests/wpt/blob/master/css/css-text/word-break/auto-phrase/word-break-auto-phrase-wbr-nobr-001.html>.
> I'm also talking to WebKit about tests, since there are currently two known
> engines; one in ICU and one in macOS/iOS. We'll work together to ensure
> words in tests are common and easy enough for both engines.
>

In case this helps, the situation is the same as hyphenation tests. In the
past, wpt tests needed updates when one implementation hyphenates
differently from other browsers. I remember this happened at least once
before.

Four tests failing is strange, thanks for pointing them out too, they all
> pass in Chromium bots. I'll check them and make sure they're all green
> before shipping.
>

I've figured them out, all fixes landed, I'll watch when wpt.fyi will be
updated. One was a recent spec change I wasn't aware of, three were
differences between wpt bots and chromium bots (#41851
<https://github.com/web-platform-tests/wpt/issues/41851>.)

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