CSS3 attr() function for all properties
While `attr()` is supported for effectively all browsers for the `content` property, CSS Values and Units Level 5 adds the ability to use `attr()` on **any** CSS property, and to use it for non-string values (e.g. numbers, colors).
types: `calc()`: `<number>` value support
javascript built-in: intl: `supportedvaluesof()`: `"numberingsystem"`
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