Property Reference - CSS Reference - page 128

Name
border-image-outset
Values:
[ <length> | <number> ]{1,4}
Initial value:
0
Applies to:
All elements excepttable elements where border-collapse is collapse
Inherited:
No
Computed value:
Same as declared value (but see description)
Description:
Defines the distance by which a border image may exceed the border area of the element. The
values define distances from the top, right, bottom, and left edges of the border image, in that
order. Numbers are calculated with respect to the image's intrinsic coordinate system; thus,
for a raster image, the number 7 is taken to mean seven pixels. Images in formats such as SVG
may have different coordinate systems. Negative values are not permitted.
Examples:
aside {border-image-outset: 2;}
div#pow {border-image-outset: 10 17 13 5;}
Note:
As of early 2011, browsers did not support border-image-outset . It is included because
border-image (which encompasses border-image-outset ) wassupported and browsers
were expected to add border-image-outset support by the end of 2011.