Heading atom
H1–H6 headings.
Example
Wording
Headings act as labels to group content and should be worded as objects instead of calls to action. Exceptions include page titles and wizards when the primary content header represents a step in a multi-page process.
Capitalization (title case)
Capitalize every word except articles (a, an, the), coordinating conjunctions (and, or), and prepositions of four or fewer letters, except when part of a verb phrase, such as Starting Up the Computer. Always capitalize the first and last word, even if it is an article, a conjunction, or a preposition of four or fewer letters.