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Border image
Source
Slice
Value
Fill
Width
Outset
Repeat
Border radius
Border style
Padding

“The parameters comprise sequences which are theoretically infinite but limits are, of course, set to them in practice. There is an upward limit to size and certainly a downward one... Within these sequences there are reasonable bounds; extremes set by technical and functional experience”

In Designing Programmes by Karl Gerstner

.css-gui-element {
  border-image: url("https://source.unsplash.com/random") 15%  / 25px / 54px stretch;
  border-radius: 0px;
  border-style: solid;
  padding: 64px;
}