Text Alternatives: Provide text alternatives for any non-text content
All non-text content that is presented to the user has a text alternative that serves the equivalent purpose, except for the situations listed below.
Time-based Media: Provide alternatives for time-based media
NOTE: If the audio or video is designated as an alternative to web content (e.g., an audio or sign language version of a web page, for example), then the web content itself serves as the alternative.
For prerecorded audio-only and prerecorded video-only media, the following are true, except when the audio or video is a media alternative for text and is clearly labeled as such:
Captions are provided for all prerecorded audio content in synchronized media, except when the media is a media alternative for text and is clearly labeled as such.
An alternative for time-based media or audio description of the prerecorded video content is provided for synchronized media, except when the media is a media alternative for text and is clearly labeled as such.
Captions are provided for all live audio content in synchronized media.
Audio description is provided for all prerecorded video content in synchronized media.
Adaptable: Create content that can be presented in different ways (e.g., simpler layout) without losing information or structure
Information, structure, and relationships conveyed through presentation can be programmatically determined or are available in text.
When the sequence in which content is presented affects its meaning, a correct reading sequence can be programmatically determined.
Instructions provided for understanding and operating content do not rely solely on sensory characteristics of components such as shape, size, visual location, orientation, or sound.
Note: For requirements related to color, refer to Guideline 1.4.
Distinguishable: Make it easier for users to see and hear content including separating foreground from background
Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.
Note: This success criterion addresses color perception specifically. Other forms of perception are covered in Guideline 1.3 including programmatic access to color and other visual presentation coding.
If any audio on a Web page plays automatically for more than 3 seconds, either a mechanism is available to pause or stop the audio, or a mechanism is available to control audio volume independently from the overall system volume level.
Note: Since any content that does not meet this success criterion can interfere with a user's ability to use the whole page, all content on the Web page (whether or not it is used to meet other success criteria) must meet this success criterion. See Conformance Requirement 5: Non-Interference.
The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following:
Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.
If the technologies being used can achieve the visual presentation, text is used to convey information rather than images of text except for the following:
Note: Logotypes (text that is part of a logo or brand name) are considered essential.
