Success Criterion 1.4.12 Text Spacing (Level AA): In content implemented using markup languages that support the following text style properties, no loss of content or functionality occurs by setting all of the following and by changing no other style property:
- Line height (line spacing) to at least 1.5 times the font size;
- Spacing following paragraphs to at least 2 times the font size;
- Letter spacing (tracking) to at least 0.12 times the font size;
- Word spacing to at least 0.16 times the font size.
Exception: Human languages and scripts that do not make use of one or more of these text style properties in written text can conform using only the properties that exist for that combination of language and script.
The intent of this success criterion is to make sure that people with low vision & cognitive challenges are provided with option to modify the spacing between characters, lines & paragraphs. Users will be able to read much better when there is enough spacing between letters, lines & paragraphs. Users can avail one or more of these options by loading an alternative CSS style sheet or use an accessibility bookmarklet or a browser extension.
The web page author doesn’t have to provide these options on the website but need to ensure that content adjusts properly when some of these options are applied. Making sure that website is in responsive design & not using the fixed containers will help achieve this success criterion. Also, ensure there is no loss of functionality when the text spacing is applied by the users.
PDF’s, video captions, images of text & logos are not covered by this success criterion because this guideline applies to the content created by markup languages.