ee3c8c01_CSS_Masking_Module_Level_1__Computed_value
[Name] mask-box-slice [Value] [ | ]{1,4} fill? [Initial] 0 fill [Applies to] All elements. In SVG, it applies to container elements without the element and all graphics elements [Inh.] no [%ages] refer to size of the mask image [Media] visual [Animatable] no [Computed value] 
as specified
CSS Masking Module Level 1
Computed value