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mask-mode

The mask-mode CSS property sets whether the mask reference defined by mask-image is treated as a luminance or alpha mask.

/* Keyword values */
mask-mode: alpha;
mask-mode: luminance;
mask-mode: match-source;

/* Multiple values */
mask-mode: alpha, match-source;

/* Global values */
mask-mode: inherit;
mask-mode: initial;
mask-mode: unset;

Syntax

The mask-mode property is specified as one or more of the keyword values listed below, separated by commas.

Values

alpha
This keyword indicates that the transparency (alpha channel) values of the mask layer image should be used as the mask values.
luminance
This keyword indicates that the luminance values of the mask layer image should be used as the mask values.
match-source

If the mask-image property is of type <mask-source>, the luminance values of the mask layer image should be used as the mask values.

If it is of type <image>, the alpha values of the mask layer image should be used as the mask values.

Formal definition

Initial value match-source
Applies to all elements; In SVG, it applies to container elements excluding the defs element and all graphics elements
Inherited no
Computed value as specified
Animation type discrete

Formal syntax

<masking-mode>#

where
<masking-mode> = alpha | luminance | match-source

Examples

Using alpha mask mode

Specifications

Specification Status Comment
CSS Masking Module Level 1
The definition of 'mask-mode' in that specification.
Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
mask-mode No No 53 No No No
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
mask-mode No No 53 No No No

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https://developer.mozilla.org/en-US/docs/Web/CSS/mask-mode