Periods

Don’t use periods in headings, subheadings, UI titles, UI text, or simple lists (three or fewer words per item).

End all sentences with a period. Put one space after a period.

When a phrase ending with a colon introduces a bulleted list:

• If one or more list elements complete the introductory phrase preceding the colon, use a period after every list element.

• If all list elements are short phrases (three words or fewer), don’t end them with periods, even if they form a complete sentence together with the list introduction.

• If one or more list elements are complete sentences, use a period after every element, even if a list element contains three or fewer words.