https://drafts.csswg.org/css-backgrounds-4/#the-border-color
The stripes defined by <image-1D> follow the shape of the border on the side to which they apply, and are drawn in bands starting from the padding edge and progressing outwards.
But then in the example the colors seem to progress inwards??
border-color: stripes(skyblue, black) stripes(orange, yellow) stripes(yellowgreen, black) stripes(indianred, yellow);
