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http://caniuse.com/#feat=css-featurequeries http://www.w3.org/TR/css3-conditional/#at-supports Examples: @supports (flex-wrap: wrap) { } Unexpected token LPAREN found Unexpected token WS found Unexpected token RPAREN found @supports not (flex-wrap: wrap) { } Unexpected token NOT found Unexpected token LPAREN found
Stumble on this issue in production, so a fix/enhancement/support is welcome It is a Candidate Recommendation at the moment https://developer.mozilla.org/en-US/docs/Web/CSS/@supports
This is still an issue. @supports is a very useful feature and I would hate to not use it simply because it breaks the syntax highlighting in the rest of the document. It is currently supported by Chrome, Firefox, Opera, Safari (incl iOS), and Edge. http://caniuse.com/#feat=css-supports-api
This is now supported by all major browsers. See: https://caniuse.com/#feat=css-featurequeries And also `@supports` can be used safely with old browsers (as rules in `@supports` clause would be ignored e.g. by IE). Only `not` operator is not safe for IE. See also: https://developer.mozilla.org/en-US/docs/Web/CSS/@supports