plainlanguage.gov/guidelines
- PUTTING EVERYTHING IN CAPITAL LETTERS IS NOT A GOOD EMPHASIS TECHNIQUE. ALTHOUGH IT MAY DRAW THE USER’S ATTENTION TO THE SECTION, IT MAKES IT HARDER TO READ. AND ONLINE, IT’S CONSIDERED SHOUTING.
gov.uk/guidance
- Government experts often say that because they’re writing technical or complex content for a specialist audience, they do not need to use plain English. This is wrong.
- Capital letters are harder to read
- As writers, we do not want people to read. We want people to recognise the ‘shape’ of the word and understand. It’s a lot faster.
- Capital letters are reputed to be 13 to 18% harder for users to read. So we try to avoid them.
stylemanual.gov.au
- Do not use all capitals for headings, unless the visual design for the content meets WCAG 2.1 in all respects.
forgov.qld.gov.au
- Do not use all capitals—this format is reserved for DANGER and WARNING signs.
Harvard
- Avoid using all caps. Readability is reduced with all caps because all words have a uniform rectangular shape, meaning readers can't identify words by their shape.
Low vision accessibility w3c
- Text in all capital letters is more difficult to read for most people, with and without disabilities.
visionaustralia.org
- Limit the use of ALL CAPS text