enum CSSAngleUnit {
    "deg", "rad", "grad", "turn"
};

[
    Constructor(double value, CSSAngleUnit unit),
    Exposed=(Window,PaintWorklet),
    RuntimeEnabled=CSSTypedOM,
    RaisesException=Constructor
] interface CSSAngleValue : CSSStyleValue {
    readonly attribute double degrees;
    readonly attribute double radians;
    readonly attribute double gradians;
    readonly attribute double turns;
};