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.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Syntax
/* <length> value */ border-image-outset: 1rem; /* <number> value */ border-image-outset: 1.5; /* vertical | horizontal */ border-image-outset: 1 1.2; /* top | horizontal | 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: 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
[ <length> | <number> ]{1,4}
Examples
Outsetting a border image
HTML
<div id="outset">This element has an outset border image!</div>
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 | Status | Comment |
---|---|---|
CSS Backgrounds and Borders Module Level 3 The definition of 'border-image-outset' in that specification. |
Candidate Recommendation | Initial definition |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
border-image-outset | Chrome Full support 15 | Edge Full support 12 | Firefox Full support 15 | IE Full support 11 | Opera Full support 15 | Safari Full support 6 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 15 | Opera Android Full support 14 | Safari iOS Full support 6 | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support