Why the horizontal lines stands separately

Question

while using hr width the line stands separately why???

Answer 1

I don't know quite what you mean but I think it's because... Oh I'll just see if I can make a picture

\
\ This lines boundaries is a square

. . .
.\ . Here's it's boundaries
.. \.

\ \
\ \ here's two beside each other

. . .. . .
.\ ..\ . Here they are with boundaries visible
.. \... \.

Do you see why? Or is that not what you asked.😀