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. Understanding 1.4.12 Show Hide techniques and failures for 1.4.12 Sufficient Advisory Failures Sufficient Techniques for Success Criterion 1.4.12 Note: Other techniques may also be sufficient if they meet the success criterion. See Understanding Techniques. C36: Allowing for text spacing override C35: Allowing for text spacing without wrapping Advisory Techniques for Success Criterion 1.4.12 C8: Using CSS letter-spacing to control spacing within a word C21: Specifying line spacing in CSS C28: Specifying the size of text containers using em units Failures for Success Criterion 1.4.12 F104: Failure of Success Criterion 1.4.12 due to clipped or overlapped content when text spacing is adjusted Back to top 1.4.13 Content on Hover or Focus Level AA (Added in 2.1) Where receiving and then removing pointer hover or keyboard focus triggers additional content to become visible and then hidden, the following are true: Dismissible: A mechanism is available to dismiss the additional content without moving pointer hover or keyboard focus, unless the additional content communicates an input error or does not obscure or replace other content; Hoverable: If pointer hover can trigger the additional content, then the pointer can be moved over the additional content without the additional content disappearing; Persistent: The additional content remains visible until the hover or focus trigger is removed, the user dismisses it, or its information is no longer valid. Exception: The visual presentation of the additional content is controlled by the user agent and is not modified by the author.