Quirk: bare <li> have list-style-position: inside

[zcorpan]

Fixes #10958.

• At least two implementers are interested (and none opposed):
  • WebKit? (this matches @nt1m 's Make list-style-position quirk only available in quirks mode WebKit/WebKit#37176 except for dir, menu)
  • Gecko
• Tests are written and can be reviewed and commented upon at:
  • HTML: test <li> list-style-position in quirks mode and standards mode web-platform-tests/wpt#50348
• Implementation bugs are filed:
  • Chromium: https://issues.chromium.org/issues/41241289
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1799724
  • WebKit: https://bugs.webkit.org/show_bug.cgi?id=283738
  • Deno (only for timers, structured clone, base64 utils, channel messaging, module resolution, web workers, and web storage): …
  • Node.js (only for timers, structured clone, base64 utils, channel messaging, and module resolution): …
• Corresponding HTML AAM & ARIA in HTML issues & PRs: N/A
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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/rendering.html ( diff )

[Loirooriol]

Should this go to https://quirks.spec.whatwg.org/ instead of HTML?

[zcorpan]

@Loirooriol no, HTML already has quirks mode style rules like this. Eventually, all quirks should be upstreamed to the appropriate spec instead of being defined in a delta spec.

[zcorpan]

Marking "do not merge yet" for #10958 (comment) (also see earlier comments).

[zcorpan]

I've updated this PR to also apply this behavior in standards mode and to include menu and dir in the selector, per web compat research findings. I've also updated the tests.

[emilio]

Slight preference to align on current WebKit / Firefox Nightly behavior (just quirks and no dir / menu) fwiw... There may be other compat impact of making the change to computed styles in standards mode so if we can get away with it seems preferable, specially if the visual impact is minimal

[emilio]

(Plus those selectors are not particularly cheap)

[zcorpan]

I've changed this again to only apply in quirks mode.

[emilio]

Ok, seems fine to put dir/menu on my end again. @nt1m given the discussions above does it seems reasonable to you?