mask-border-width

The mask-border-width CSS property sets the width of an element’s mask border.

Values: <length-percentage> The width of the mask border, specified as a <length> or a <percentage>. Percentages are relative to the width of the border area for horizontal offsets and the height of the border area for vertical offsets. Must not be negative. <number> The width of the mask border, specified as a multiple of the corresponding border-width. Must not be negative. auto The width of the mask border is made equal to the intrinsic width or height (whichever is applicable) of the corresponding mask-border-slice. If the image does not have the required intrinsic dimension, the corresponding border-width is used instead.

Syntax example: mask-border-width: auto;