maskBorderWidth

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

Syntax: [ <length-percentage> | <number> | auto ]{1,4}

Initial value: auto

|                 Chrome                 | Firefox |                Safari                | Edge | IE  |
| :------------------------------------: | :-----: | :----------------------------------: | :--: | :-: |
|   1   _(-webkit-mask-box-image-width)_ |   No    |                 17.2                 | n/a  | No  |
|                                        |         | 3.1 _(-webkit-mask-box-image-width)_ |      |     |

See also