border-image-outset
Controls how far outside the element's actual box the border image is drawn. It's useful for making a decorative border appear as if it's 'floating' around its container.
It is documented as part of the CSS Backgrounds and Borders specification.
Syntax
/* Usage Example */
.fancy-container {
border: 10px solid transparent;
border-image-source: url(';frame.png');
border-image-slice: 30;
/* Extends the image 5px beyond the box */
border-image-outset: 5px;
}
/* Syntax */
border-image-outset: length;
border-image-outset: number;
/* Global values */
border-image-outset: inherit;
border-image-outset: initial;
border-image-outset: revert;
border-image-outset: revert-layer;
border-image-outset: unset;border-image-outset Browser support
Widely available
Since
2017 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2017.
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