JavaScript, one word, capital S
Home page as two words, never homepage
Style sheet as two words, never stylesheet
No Oxford commas
internet is lowercase
Use website, not web site or Web site
Use web page, never webpage or Web page
Use web in lowercase, never Web
Use custom element in lowercase, never Custom Element
Use web component in lowercase, never Web Component
Breakpoint as one work, not break point
Flexbox with no space, capital F and lowercase B; i.e. not FlexBox or Flex Box or flexbox.
Sign up when it’s a verb, Signup when it’s a noun
Prefer “reader” to “user” for the person viewing a web page
Prefer “author” to “user” for a Hot Page user