I guess an analogous example is https://drafts.css-houdini.org/css-properties-values-api/#initial-value-descriptor ```css @property --foo { syntax: "<length>"; inherits: false; initial-value: 1px; initial-value: 1; } ``` where the `initial-value: 1` is invalid according to the `syntax: "<length>"` grammar. Then the entire `@property` rule is invalid, it doesn't fall back to `initial-value: 1px`. -- GitHub Notification of comment by Loirooriol Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5698#issuecomment-723291258 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Friday, 6 November 2020 20:43:42 UTC
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