RESOLVED FIXED 189692
Implement CSS Custom Properties and Values API Level 1 
https://bugs.webkit.org/show_bug.cgi?id=189692
Summary Implement CSS Custom Properties and Values API Level 1
Attachments
Add attachment proposed patch, testcase, etc.
Justin Michaud
Comment 1 2018-09-18 00:06:49 PDT
<rdar://30061591>
Simon Fraser (smfr)
Comment 2 2018-09-18 11:07:43 PDT
You should make a patch for Source/WebCore/features.json to say this is "under development".
legacyazd
Comment 3 2022-05-16 01:56:05 PDT
This is a useful feature. See the Stack Overflow post: [animating gradients in CSS](https://stackoverflow.com/a/63848864/8583692) for a use case. Only Firefox (related bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1684605) and Safari has not yet implemented this.
Antti Koivisto
Comment 4 2023-01-04 09:19:38 PST
This is enabled by default since <https://commits.webkit.org/258246@main>
Sergey Rubanov
Comment 5 2023-07-04 19:34:18 PDT
What is the stable version of Safari where this feature was shipped? Was it Safari 16.4? I want to update the https://ishoudinireadyyet.com table.
Sergey Rubanov
Comment 6 2023-07-04 19:49:07 PDT
Just found it in the 16.4 release notes (https://developer.apple.com/documentation/safari-release-notes/safari-16_4-release-notes)
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