What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

crbug 27659: Chrome can not render complex ruby text, and maybe WebKit too.

What browsers does this problem apply to, if applicable?

Chromium (Chrome, Edge 79+, Opera, Samsung Internet), Safari

What did you expect to see?

A nuanced listing explaining that Chromium (I think) implements an earlier spec and won't have correct behavior in advanced cases, where the specs presumably diverge.

Did you test this? If so, how?

https://web.archive.org/web/20111201092638/http://www.w3.org/International/tests/tests-html-css/tests-ruby/generate?test=6 passes correctly on Firefox 121 but fails on Chromium 120.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

Do you have anything more you want to share?

Ran into this while working around missing ruby-align support (and a wish for more fine-adjustment) by having a zero-width <rt> with height, and overlapping the text correctly with a relative/absolute/inset combo.

Tailwind follows:

<b class="inline-block relative mt-[-1lh]">
    <ruby class="inline-block z-1 rotate-[0deg]">ale<rt class="text-lg w-0"></rt></ruby><span
            class="inline-block absolute inset-x-0 text-center z-0 text-lime-400">∞</span>
    <!-- colors are a wip -->
</b>.

firefox	blink

I'm not sure if this particular example is correct but I think it should at least fail consistently.

MDN URL

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/rt

MDN metadata