1.1.1 For non-text content that is used to convey information, text alternatives convey the same information, unless the non-text content is multimedia, live audio-only or live video-only. [How to meet 1.1.1]
Note: For requirements for synchronized alternatives for multimedia refer to Guideline 1.2 Provide synchronized alternatives for multimedia.
1.1.2 For multimedia, live audio-only or live video-only content, text alternatives identify the content with a descriptive label. (See also, Guideline 1.2 Provide synchronized alternatives for multimedia. .) [How to meet 1.1.2]
1.1.3 For non-text content that is functional, text alternatives serve the same purpose as the non-text content. If text alternatives can not serve the same purpose as the functional non-text content, text alternatives identify the purpose of the functional non-text content. [How to meet 1.1.3]
1.1.4 For non-text content that is intended to create a specific sensory experience, text alternatives at least identify the non-text content with a descriptive label. [How to meet 1.1.4]
1.1.5 Non-text content that is not functional, is not used to convey information, and does not create a specific sensory experience is implemented such that it can be ignored by assistive technology. [How to meet 1.1.5]
1.1.6 For prerecorded multimedia content, a combined document containing both captions and transcripts of audio descriptions of video is available. [How to meet 1.1.6]
1.2.1 Captions are provided for prerecorded multimedia. [How to meet 1.2.1]
Editorial Note: The working group is seeking comment on the following proposal:
Change 1.2.1 to " Provide captions OR provide a text transcript of all audio intermixed with a text description of what is happening visually."
so authors have an option of providing captions OR a text script. Then, at Level 2, require captions.
1.2.2 Audio descriptions of video are provided for prerecorded multimedia. [How to meet 1.2.2]
Editorial Note: The working group is seeking comment on the following proposal:
Change 1.2.2 to " Provide audio descriptions OR provide a text transcript of all audio intermixed with a text description of what is happening visually."
so authors have an option of providing audio descriptions OR a text script. Then, at Level 2, require audio descriptions.
1.2.3 Real-time captions are provided for live multimedia. [How to meet 1.2.3]
1.2.4 Sign language interpretation is provided for multimedia. [How to meet 1.2.4]
1.2.5 Extended audio descriptions of video are provided for prerecorded multimedia. [How to meet 1.2.5]
1.3.1 Perceivable structures within the content can be programmatically determined. [How to meet 1.3.1]
1.3.2 When information is conveyed by color, the color can be programmatically determined or the information is also conveyed through another means that does not depend on the user's ability to differentiate colors. [How to meet 1.3.2]
1.3.3 Information that is conveyed by variations in presentation of text is also conveyed in text or the variations in presentation of text can be programmatically determined. [How to meet 1.3.3]
1.3.4 Any information that is conveyed by color is visually evident when color is not available. [How to meet 1.3.4]
1.3.5 When content is arranged in a sequence that affects its meaning, that sequence can be programmatically determined. [How to meet 1.3.5]
1.3.6 Information required to understand and operate content does not rely on shape, size, visual location, or orientation of components. [How to meet 1.3.6]
1.4.1 Text or diagrams, and their background, have a luminosity contrast ratio of at least 5:1. [How to meet 1.4.1]
1.4.2 A mechanism is available to turn off background audio that plays automatically. [How to meet 1.4.2]
1.4.3 Text or diagrams, and their background, have a luminosity contrast ratio of at least 10:1. [How to meet 1.4.3]
1.4.4 Audio content does not contain background sounds or the background sounds are at least 20 decibels lower than the foreground audio content, with the exception of occasional sound effects. [How to meet 1.4.4]
Note: A 20 decibel difference in sound level is roughly 4 times quieter (or louder). Background sound that meets this requirement will be approximately four times (4x) quieter than the foreground audio content.
2.1.1 All functionality of the content is operable in a non time-dependent manner through a keyboard interface, except where the task requires analog, time-dependent input. [How to meet 2.1.1]
Note: This does not preclude and should not discourage the support of other input methods (such as a mouse) in addition to keyboard operation.
2.1.2 All functionality of the content is operable in a non time-dependent manner through a keyboard interface. [How to meet 2.1.2]
2.2.1 For each time-out that is a function of the content, at least one of the following is true: [How to meet 2.2.1]
the user is allowed to deactivate the time-out or;
the user is allowed to adjust the time-out over a wide range which is at least ten times the length of the default setting or;
the user is warned before time expires and given at least 20 seconds to extend the time-out with a simple action (for example, "hit any key") and the user is allowed to extend the timeout at least 10 times or;
the time-out is an important part of a real-time event (for example, an auction), and no alternative to the time-out is possible or;
the time-out is part of an activity where timing is essential (for example, competitive gaming or time-based testing) and time limits can not be extended further without invalidating the activity.
Editorial Note: The Working Group is considering adding techniques and/or modifying the success criterion to ensure additional accessibility features are employed for events where no alternative to a timeout is possible or where timing is essential.
2.2.2 Content does not blink for more than 3 seconds, or a method is available to stop any blinking content in the delivery unit. [How to meet 2.2.2]
Note: Refer to Guideline 2.3 Allow users to avoid content that could cause seizures due to photosensitivity. for requirements for avoiding creating content that could cause seizures due to photosensitivity.
Editorial Note: Is there a widespread problem with individuals who are so transfixed, that they are unable to turn blinking content off (so that the second option in the above success criterion would not be possible)?
2.2.3 Content can be paused by the user unless the timing or movement is part of an activity where timing or movement is essential. [How to meet 2.2.3]
2.2.4 Except for real-time events, timing is not an essential part of the event or activity presented by the content. [How to meet 2.2.4]
2.2.5 Interruptions, such as updated content, can be postponed or suppressed by the user, except those involving an emergency. [How to meet 2.2.5]
2.2.6 When an authenticated session has an inactivity timeout, the user can continue the activity without loss of data after re-authenticating. [How to meet 2.2.6]
2.3.1 When content violates either the general flash threshold or the red flash threshold, users are warned in a way that allows them to avoid it. [How to meet 2.3.1]
2.3.2 Content does not violate the general flash threshold or the red flash threshold. [How to meet 2.3.2]
2.5.1 If an input error is detected, the error is identified and described to the user in text. [How to meet 2.5.1]
2.5.2 If an input error is detected and suggestions for correction are known and can be provided without jeopardizing the security or purpose of the content, the suggestions are provided to the user. [How to meet 2.5.2]
2.5.3 For forms that cause legal or financial transactions to occur, that modify or delete data in data storage systems, or that submit test responses, at least one of the following is true: [How to meet 2.5.3]
Actions are reversible.
Actions are checked for input errors before going on to the next step in the process.
The user is able to review and confirm or correct information before submitting it.
2.5.4 Context-sensitive help is available for text input. [How to meet 2.5.4]
3.1.1 The primary natural language or languages of the delivery unit can be programmatically determined. [How to meet 3.1.1]
3.1.2 The natural language of each foreign passage or phrase in the content can be programmatically determined. [How to meet 3.1.2]
Note: This requirement does not apply to individual words or to phrases that have become part of the primary language of the content.
3.1.3 A mechanism is available for identifying specific definitions of words used in an unusual or restricted way, including idioms and jargon. [How to meet 3.1.3]
3.1.4 A mechanism for finding the expanded form of abbreviations is available. [How to meet 3.1.4]
3.1.5 When text requires reading ability more advanced than the lower secondary education level, one or more of the following types of supplemental content is available: [How to meet 3.1.5]
A text summary that requires reading ability less advanced than the lower secondary education level.
Graphical illustrations of concepts or processes that must be understood in order to use the content.
A spoken version of the text content.
3.2.1 When any component receives focus, it does not cause a change of context. [How to meet 3.2.1]
3.2.2 Changing the setting of any input field does not automatically cause a change of context . [How to meet 3.2.2]
3.2.3 Navigational mechanisms that are repeated on multiple delivery units within a set of delivery units occur in the same relative order each time they are repeated unless a change is initiated by the user. [How to meet 3.2.3]
3.2.4 Components that have the same functionality in multiple delivery units within a set of delivery units are identified consistently. [How to meet 3.2.4]
3.2.5 Changes of context are initiated only by user request. [How to meet 3.2.5]
4.1.1 Delivery units can be parsed unambiguously and the relationships in the resulting data structure are also unambiguous. [How to meet 4.1.1]
4.1.2 The role, state, and value can be programmatically determined for every user interface component in the Web content that accepts input from the user or changes dynamically in response to user input or external events. [How to meet 4.1.2]
4.1.3 The label of each user interface control in the Web content that accepts input from the user can be programmatically determined and is explicitly associated with the control. [How to meet 4.1.3]
4.1.4 The content and properties of user interface elements in the Web content that can be changed via the user interface can also be directly changed programmatically. [How to meet 4.1.4]
Note: Some examples of standardized properties that typically can be changed by the user interface include its value, whether it is currently selected, and whether it currently has the focus.
Editorial Note: The working group is still considering whether this criterion should be included and, if so, at what level.
4.1.5 Changes to content, structure, selection, focus, attributes, values, state, and relationships of the user interface elements in the Web content can be programmatically determined. [How to meet 4.1.5]
4.2.1 If content does not meet all level 1 success criteria, then an alternate version is available from the same URI that does meet all level 1 success criteria. [How to meet 4.2.1]
4.2.2 Content meets the following criteria even if the content uses a technology that is not in the chosen baseline: [How to meet 4.2.2]
When content violates either the general flash threshold or the red flash threshold, users are warned in a way that allows them to avoid it.
If the user can enter the content using the keyboard, then the user can exit the content using the keyboard.
4.2.3 Content implemented using technologies outside of the chosen baseline satisfies all level 1 and 2 WCAG requirements supported by the technologies. [How to meet 4.2.3]