1.3.1-1 Conventional Use of Mixed Case

Text to be read (except labels) should be presented using upper and lower case characters.

Additional Information:
Reading text is easier and faster when capitalization is used conventionally to start sentences and to indicate proper nouns and acronyms. There are several exceptions, however. An item intended to attract the user's attention, such as a label or title, can be displayed in upper case. In addition, upper case should be used when lower case letters will have decreased legibility, e.g., on a display terminal that cannot show true descenders for lower case letters.