The top border should always be 2 pixels high, the right should be 5 pixels, the bottom should be 10 pixels and the left should be 15 pixels.

This element should have a dotted border all around.
This element should have a dashed border on the top and bottom.
This element should have a double border on the right and left.
This element should have a groove border only on the top.
This element should have a ridge border only on the right.
This element should have an inset border only on the bottom.
This element should have an outset border only on the left.

I want to know what the default border measures.