Summary:
Adding a new `auto` value as the initial value of CSS `quotes` property, with the behavior that language-sensitive quotation marks (derived from CLDR) are used for quote-open/close generated content.

Bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1421938

Standard:
https://drafts.csswg.org/css-content-3/#quotes (not yet updated to reflect recent WG resolution)
https://html.spec.whatwg.org/multipage/rendering.html#quotes

Platform coverage:
All

Preference:
None, enabled globally.

DevTools bug:
None, the new value is automatically exposed in devtools

Other browsers:
Both webkit and blink have long shipped similar language-sensitive quote-mark behavior as a "magic" initial value of the `quotes` property (not serializable/round-trippable). The CSS WG resolved to add `auto` as the name of this "magic" value in https://github.com/w3c/csswg-drafts/issues/4074.

web-platform-tests:
Collection of WPT reftests included in the bug. Many are based on pre-existing W3C i18n tests (not run in CI).

Secure contexts:
No; additional value for existing CSS property, needed in all contexts for interoperability with other browsers that already have this behavior by default.

Is this feature enabled by default in sandboxed iframes?
Yes.
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