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border-image-width

The border-image-width CSS property defines the width of the border image by defining inward offsets from the border edges. If the border-image-width is greater than the border-width, then the border image extends beyond the padding (and/or content) edge.

Initial value	`1`
Applies to	all elements, except table elements when `border-collapse` is `collapse`. It also applies to `::first-letter`.
Inherited	no
Percentages	refer to the width or height of the border image area
Media	visual
Computed value	as specified, but with relative lengths converted into absolute lengths
Animation type	discrete
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

/* border-image-width: all */
border-image-width: 3;

/* border-image-width: vertical horizontal */
border-image-width: 2em 3em;

/* border-image-width: top horizontal bottom */
border-image-width: 5% 15% 10%;

/* border-image-width: top right bottom left */
border-image-width: 5% 2em 10% auto;

/* Global values */
border-image-width: inherit;
border-image-width: initial;
border-image-width: unset;

where:

width: Is a value denoting the width of the image used as a border to apply to all four edges. It is used only in the one-value syntax.
vertical: Is a value denoting the width of the image used as a border to apply to all vertical edges, that is the top and bottom edges. It is used only in the two-value syntax.
horizontal: Is a value denoting the width of the image used as a border to apply to all horizontal edges, that is the right and left edges. It is used only in the two- and three-value syntaxes.
top: Is a value denoting the width of the image used as a border to apply to the top edge. It is used only in the three- and four-value syntaxes.
bottom: Is a value denoting the width of the image used as a border to apply to the bottom edge. It is used only in the three- and four-value syntaxes.
right: Is a value denoting the width of the image used as a border to apply to the right edge. It is used only in the four-value syntax.
left: Is a value denoting the width of the image used as a border to apply to the left edge. It is used only in the four-value syntax.
inherit: Is a keyword indicating that all four values are inherited from their parent's element calculated value.

Values

<length-percentage>: Represents the width of the border. It can be an absolute or relative length. Percentages refer to the width of the border image area for horizontal offsets and the height of the border image area for vertical offsets. This length must not be negative.
<number>: Represents a multiple of the computed value of the element's border-width property to be used as the border width. The number must not be negative.
auto: Causes the border image width to equal the intrinsic width or height (whichever is applicable) of the corresponding border-image-slice. If the image does not have the required intrinsic dimension then the corresponding computed border-width is used instead.

Formal syntax

[ <length-percentage> | <number> | auto ]{1,4}where 
<length-percentage> = <length> | <percentage>

Examples

HTML Content

<!DOCTYPE html>

<html>
   <head></head>
   <body>
      <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy 
      eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. 
      At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, 
      no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
   </body>
</html>

CSS Content

p {
   border-image-source: url("https://mdn.mozillademos.org/files/10470/border.png");
   border-image-slice: 30;
   border-image-width: 20px;
   border-image-repeat: round;
   padding: 40px;
}

Specifications

Specification	Status	Comment
CSS Backgrounds and Borders Module Level 3 The definition of 'border-image-width' in that specification.	Candidate Recommendation	Initial definition

Browser compatibility

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	15.0	(Yes)	13.0 (13.0)	11	15	6

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	(Yes)	13.0 (13.0)	No support	?	?

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https://developer.mozilla.org/en-US/docs/Web/CSS/border-image-width