/* Keyword values */ mask-border-mode: luminance; mask-border-mode: alpha; /* Global values */ mask-border-mode: inherit; mask-border-mode: initial; mask-border-mode: revert; mask-border-mode: revert-layer; mask-border-mode: unset;
The luminance values of the mask border image are used as the mask values.
The alpha values of the mask border image are used as the mask values.
This property doesn't yet seem to have support anywhere. When browsers support it, it will specify the type of blending mode used for the mask border — luminance or alpha:
mask-border-mode: luminance; mask-border-mode: alpha;
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