border-image-width CSS property.

Values: [ <length> | <percentage> | <number> | auto ]{1,4}
Initial value: 1
Applies to: All elements, except table elements when 'border-collapse' is 'collapse'
Inherit: no
Percentages: Relative to width/height of the border image area
Animatable:
Media: visual
Computed value:

CSS Standards

CSS 1
CSS 2
CSS 2.1
CSS 3
No
No
No
Yes