Title case capitalization

Main surprise:

lowercase only minor words that are three letters or fewer in a title or heading (except the first word in a title or subtitle or the first word after a colon, em dash, or end punctuation in a heading):

• short conjunctions (e.g., “and,” “as,” “but,” “for,” “if,” “nor,” “or,” “so,” “yet”)
• articles (“a,” “an,” “the”)
• short prepositions (e.g., “as,” “at,” “by,” “for,” “in,” “of,” “off,” “on,” “per,” “to,” “up,” “via”)