From what I've noticed, the typical standard for most CSS properties involves using "top/bottom, left/right" to define values. However, one exception to this seems to be border-spacing.
I can't help but wonder if the use of "left/right, top/bottom" shorthand for border-spacing was done intentionally. It always catches me off guard, and it makes me question whether w3 overlooked this inconsistency.
This explanation is a bit unique because unlike properties like border-width or margin, only two values are allowed:
border-width: 10px 50px 10px 50px; /* valid */
border-spacing: 10px 50px 10px 50px; /* invalid */
This distinction can be attributed to the specific nature of these properties.
In cases where shorthand notation is used for other properties allowing up to four values:
border-width: 10px 50px;
It simply indicates that the bottom and left values mirror those on the opposite side:
border-width: 10px 50px 10px 50px;
/* top right btm left */
Similarly, with three values:
border-width: 10px 50px 20px;
This equates to:
border-width: 10px 50px 20px 50px;
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