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Related: W3C Manual of Style


  • comma before conjunction, e.g.: apples, oranges, and bananas.
  • punctuation outside quoted terms
    • e.g.: This accessibility requirement is sometimes called sufficient "color contrast"; however, that is incorrect — technically it's "luminosity contrast".
    • (Note: Many American-English style guides, including the Chicago Manual of Style, recommend periods and commas inside quotes. Most British-English style guides recommend punctuation outside quotes. Coding requires proper nesting. Because most of our audience is more focused on proper code syntax than on America-English syntax, we chose punctuation outside quoted terms.)
  • Commas after introductory prepositional clauses, especially in sentences that are a bit long or complex.
  • Comma (or colon) after "for example," and "e.g.,". Note: for Recommendations and other formal docs, probably better to use "for example" instead of "e.g.".


  • web/Web capitalization
    • web - lowercase as adjective
    • Web - can capitalize when referring to the World Wide Web, or leave lower case for consistency within a document
  • Working Groups, Task Forces
    • XYZ Working Group - capitalize when talking about a specific working group, including, "the Working Group" without the name of the WG in the phrase.
    • working groups - lowercase when talking generically about working groups. However, OK to capitalize if seems better for consistency within a doc.
    • if in doubt, capitalize.
    • same for Task Forces.

One word, Two word, Hyphenation

  • website - one word
  • e-mail - hyphenated


  • "for example" instead of "for instance" usually