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https://www.w3.org/TR/css-values-4/#functional-notation
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> Some legacy functional notations, such as rgba(), use commas unnecessarily, but generally commas are only used to separate items in a list, or pieces of a grammar that would be ambiguous otherwise.
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関数表記以外だと、`transition` や `box-shadow` のように複数の値の組のリストを指定するときはカンマ区切りになります。
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