what is border-spacing?where it creats space?

Answer 1

sets the distance between the borders, it only works with (border-collapse: separate) property.

eg:
border-collapse: separate
border-spacing: 20px 40px-/*it defines leave space of 20px to x-axis, and 40px to y-axis */

Answer 2

Shows spacing for both x and y axes
Eg border-spacing: 10px 20px
10px for x-axis and 20px for y-axis

Answer 3

It's mostly used for styling tables

Answer 4

are you from Bangladesh