If an article about typography doesn't even know the difference between a slash and a backslash, how are we ever to get people to stop saying backslash when talking about URLs?
Fonts supporting the frac feature have a separate set of smaller numbers, and these get dynamically composed into fractions once you type them.
I should add that my opinion doesn't stop me from using the correct term in conversation.
I don't start a slash from the top or the bottom - I start it from the left, and go up or down.
The reasoning is simple: Draw a straight line. Lean it. Is it leaning left? It's leaning backward. Leaning right? Leaning forward.