Bug 189363 – Implement css-values toggle() notation

• Status: NEW
• Component: CSS

[Simeon Vincent]

Please implement the CSS Values specification's Toggle notation as defined in CSS Values 4 (working draft) https://drafts.csswg.org/css-values-4/#toggle-notation. The following summary and example come form that document:

The toggle() expression allows descendant elements to cycle over a list of values instead of inheriting the same value.

The following example makes <em> elements italic in general, but makes them normal if they’re inside something that’s italic:

> em { font-style: toggle(italic, normal); }

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Issues in other browser vendor bug trackers

https://bugs.chromium.org/p/chromium/issues/detail?id=715070
https://bugzilla.mozilla.org/show_bug.cgi?id=363250

[Brent Fulgham]

This doesn't appear to be on track to be implemented by any other browsers at present.