In this interactive lesson (URL=https://www.codecademy.com/courses/learn-css/lessons/box-model-intro/exercises/box-model-intro), I noticed there are 2 tags in html head elements, and the the first one only have two attributes instead of three: href and rel.
Why is the first one necessary? Why is type attribute missing in it?
P.S. I opened the URL link in another browser tab, only being shown with a plain webpage written with pure text code-like lines.