list-style-position on bare li elements

[jgraham]

Description

Some implementations do not honor list-style-position on bare li elements force but instead force the value to inside. Other implementations do support this property on bare li elements.

This is an issue with observed webcompat breakage.

Specification

https://drafts.csswg.org/css-lists/#list-style-property

Additional Signals

https://bugzilla.mozilla.org/show_bug.cgi?id=1799724
https://bugs.webkit.org/show_bug.cgi?id=164222
https://bugs.chromium.org/p/chromium/issues/detail?id=811172
https://bugs.chromium.org/p/chromium/issues/detail?id=590094

[Loirooriol]

I added a counter in Blink: https://chromestatus.com/metrics/feature/timeline/popularity/5000
~0.78% of page loads get this quirk of forcing outside markers to be inside.

[Loirooriol]

WebKit has aligned with Firefox, restricting the quirk to quirks mode.
WebKit/WebKit#37176

[nt1m]

I added a counter in Blink: https://chromestatus.com/metrics/feature/timeline/popularity/5000 ~0.78% of page loads get this quirk of forcing outside markers to be inside.

There's some data regarding domains affected on that page, if you scroll down. I didn't find any super popular sites.

[dholbert]

I filed whatwg/html#10958 to specify the quirks-mode behavior here, and I've posted a WPT for review in https://phabricator.services.mozilla.com/D235868 (just testing the standards-mode behavior for now).