Definition
CSS Masking Module Level 1 defines SVGMaskElement
[Exposed=Window]
interface SVGMaskElement : SVGElement {
readonly attribute SVGAnimatedEnumeration maskUnits;
readonly attribute SVGAnimatedEnumeration maskContentUnits;
readonly attribute SVGAnimatedLength x;
readonly attribute SVGAnimatedLength y;
readonly attribute SVGAnimatedLength width;
readonly attribute SVGAnimatedLength height;
};