border-image-outset
Baseline: Widely supported
Baseline is determined by this web feature being supported on the current and the previous major versions of major browsers.
The border-image-outset
CSS property sets the distance by which an element's border image is set out from its border box.
The parts of the border image that are rendered outside the element's border box with border-image-outset
do not trigger overflow scrollbars and don't capture mouse events.
Try it
Syntax
css
/* <length> value */
border-image-outset: 1rem;
/* <number> value */
border-image-outset: 1.5;
/* top and bottom | left and right */
border-image-outset: 1 1.2;
/* top | left and right | bottom */
border-image-outset: 30px 2 45px;
/* top | right | bottom | left */
border-image-outset: 7px 12px 14px 5px;
/* Global values */
border-image-outset: inherit;
border-image-outset: initial;
border-image-outset: revert;
border-image-outset: revert-layer;
border-image-outset: unset;
The border-image-outset
property may be specified as one, two, three, or four values. Each value is a <length>
or <number>
. Negative values are invalid and will cause the border-image-outset
declaration to be ignored.
- If one value is specified, it applies to all four sides.
- If two values are specified, the first applies to the top and bottom and the second to the left and right.
- If three values are specified, the first applies to the top, the second to the left and right, and the third to the bottom.
- If four values are specified, they apply to the top, right, bottom, and left in that order (clockwise).
Values
<length>
-
The size of the
border-image
outset as a dimension — a number with a unit. <number>
-
The size of the
border-image
outset as a multiple of the element's correspondingborder-width
s. For example, if an element hasborder-width: 1em 2px 0 1.5rem
, andborder-image-outset: 2
, the finalborder-image-outset
would be calculated as2em 4px 0 3rem
.
Formal definition
Initial value | 0 |
---|---|
Applies to | all elements, except internal table elements when border-collapse is collapse . It also applies to ::first-letter . |
Inherited | no |
Computed value | as specified, but with relative lengths converted into absolute lengths |
Animation type | by computed value type |
Formal syntax
border-image-outset =
[ <length [0,∞]> | <number [0,∞]> ]{1,4}
Examples
Outsetting a border image
HTML
html
<div id="outset">This element has an outset border image!</div>
CSS
css
#outset {
width: 10rem;
background: #cef;
border: 1.4rem solid;
border-image: radial-gradient(#ff2, #55f) 40;
border-image-outset: 1.5; /* 1.5 × 1.4rem = 2.1rem */
margin: 2.1rem;
}
Result
Specifications
Specification |
---|
CSS Backgrounds and Borders Module Level 3 # the-border-image-outset |
Browser compatibility
BCD tables only load in the browser