vertical
This is a convenience function that opens a context (BorderContext) to specify the border styles for both horizontal sides of a block at once, that is the top and bottom side via `border-top-{property}` and `border-bottom-{property}` CSS properties.
The actual styling is then done within the BorderContext using the specific topic functions of it.
See also
Parameters
value
extension function parameter to open the BorderContext as scope of the functional expression in order to use its specific styling functions.