Beginner's question: element.classList.add() and element.textContent #3

Hi, I just started learning to code, and in my first js file I tried
element.classList.add()
and
element.textContent
and found the word classList and textContent isn't colored. Is it intentional? How do I tell whether a piece of colorless code is a typo or not?

Thanks very much! I'm using the "Next" color theme.