mask-size CSS property.

Values: <bg-size>#
Initial value: auto
Applies to: All elements. In SVG, it applies to container elements excluding the <defs> element and all graphics elements
Inherit: no
Percentages: n/a
Animatable: as repeatable list of simple list of length, percentage, or calc (This means keyword values are not animatable.)
Media: visual
Computed value: as specified, but with lengths made absolute

CSS Standards

CSS 1
CSS 2
CSS 2.1
CSS 3
No
No
No
Yes