Slider Control Textures explanation

HI Everybody,

can some please provide an explanation as to how the individual texture tags of the slider control work, specially the border attribute which can contain for digits

e.g. whats does <textureslidernib border="10"> mean?
e.g. whats does <textureslidernib border="0,10"> mean?
e.g. whats does <textureslidernib border="0,0,10"> mean?
​​​​​​​​​​​​​​e.g. whats does <textureslidernib border="0,0,0,10"> mean?

And how does this relate to the height and width of the slider control if at all?

If have tried playing with the values and see how it looks like, but I can make proper sense of what the values do.

​​​​​​​Thanks