mask-border-outset
CSS
property specifies the distance by which an element's
mask border
is set out from its border box.
/* <length> value */ mask-border-outset: 1rem; /* <number> value */ mask-border-outset: 1.5; /* vertical | horizontal */ mask-border-outset: 1 1.2; /* top | horizontal | bottom */ mask-border-outset: 30px 2 45px; /* top | right | bottom | left */ mask-border-outset: 7px 12px 14px 5px; /* Global values */ mask-border-outset: inherit; mask-border-outset: initial; mask-border-outset: unset;
mask-border-outset
property may be specified as one, two, three, or four values. Each value is a
<length>
or
<number>
. Negative values are invalid.
<length>
The size of the mask border outset as a dimension.
<number>
border-width
.
| 初始值 |
0
|
|---|---|
| 适用于 |
all elements; In SVG, it applies to container elements excluding the
defs
element and all graphics elements
|
| 继承 | no |
| 计算值 | as specified, but with relative lengths converted into absolute lengths |
| 动画类型 | discrete |
[ <length> | <number> ]{1,4}
This property doesn't appear to be supported anywhere yet. When it eventually starts to be supported, it will serve to move the mask away from the inner edge of the element's border box — you can use it to make the mask start from part way across the border, rather than the inside of it.
mask-border-outset: 1rem;
Chromium-based browsers support an outdated version of this property —
mask-box-image-outset
— with a prefix:
-webkit-mask-box-image-outset: 1rem;
注意
: The
mask-border
page features a working example (using the out-of-date prefixed border mask properties supported in Chromium), so you can get an idea of the effect.
| 规范 | 状态 | 注释 |
|---|---|---|
|
CSS Masking Module Level 1
The definition of 'mask-border-outset' in that specification. |
候选推荐 | 初始定义 |
TBD