trying to understand SVG

Question

Hello, I tried to close the path (see the code below) but it did not come out as I expected.
Do you know what I did wrong?

https://code.sololearn.com/WYteezmAHBS7/#html

Answer 1

To close the path, use "z"

Answer 2

d="M50 40 H200 V0 L300 80 L200 160 L200 120 H50 50 Z"