WCAG 2.1 Success Criteria Flashcards
WCAG Success Criterion 1.1.1 Non-text Content
Level A
All non-text content that is presented to the user has a text alternative that serves the equivalent purpose
some exceptions
WCAG Success Criterion 1.2.1 Audio-only and Video-only (Prerecorded)
Level A
An alternative for time-based media is provided that presents equivalent information for prerecorded audio-only content.
Either an alternative for time-based media or an audio track is provided that presents equivalent information for prerecorded video-only content.
WCAG Success Criterion 1.2.2 Captions (Prerecorded)
Level A
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.
WCAG Success Criterion 1.2.3 Audio Description or Media Alternative (Prerecorded)
Level A
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.
WCAG Success Criterion 1.2.4 Captions (Live)
Level AA
Captions are provided for all live audio content in synchronized media.
WCAG Success Criterion 1.2.5 Audio Description (Prerecorded)
Level AA
Audio description is provided for all prerecorded video content in synchronized media.
WCAG Success Criterion 1.2.6 Sign Language (Prerecorded)
Level AAA
Sign language interpretation is provided for all prerecorded audio content in synchronized media.
WCAG Success Criterion 1.2.7 Extended Audio Description (Prerecorded)
Level AAA
Where pauses in foreground audio are insufficient to allow audio descriptions to convey the sense of the video, extended audio description is provided for all prerecorded video content in synchronized media.
WCAG Success Criterion 1.2.8 Media Alternative (Prerecorded)
Level AAA
An alternative for time-based media is provided for all prerecorded synchronized media and for all prerecorded video-only media.
WCAG Success Criterion 1.2.9 Audio-only (Live)
Level AAA
An alternative for time-based media that presents equivalent information for live audio-only content is provided.
WCAG Success Criterion 1.3.1 Info and Relationships
Level A
Information, structure, and relationships conveyed through presentation can be programmatically determined or are available in text.
WCAG Success Criterion 1.3.2 Meaningful Sequence
Level A
When the sequence in which content is presented affects its meaning, a correct reading sequence can be programmatically determined.
WCAG Success Criterion 1.3.3 Sensory Characteristics
Level A
Instructions provided for understanding and operating content do not rely solely on sensory characteristics of components such as shape, color, size, visual location, orientation, or sound.
WCAG Success Criterion 1.3.4 Orientation
Level AA
Content does not restrict its view and operation to a single display orientation, such as portrait or landscape, unless a specific display orientation is essential.
WCAG Success Criterion 1.3.5 Identify Input Purpose
Level AA
The purpose of each input field collecting information about the user can be programmatically determined
WCAG Success Criterion 1.3.6 Identify Purpose
Level AAA
In content implemented using markup languages, the purpose of user interface components, icons, and regions can be programmatically determined.
WCAG Success Criterion 1.4.1 Use of Color
Level A
Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.
WCAG Success Criterion 1.4.2 Audio Control
Level A
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.
WCAG Success Criterion 1.4.3 Contrast (Minimum)
Level AA
The visual presentation of text and images of text has a contrast ratio of at least 4.5:1
Large text has a contrast ratio of at least 3:1
WCAG Success Criterion 1.4.4 Resize Text
Level AA
Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.
WCAG Success Criterion 1.4.5 Images of Text
Level AA
text is used to convey information rather than images of text
WCAG Success Criterion 1.4.6 Contrast (Enhanced)
Level AAA
The visual presentation of text and images of text has a contrast ratio of at least 7:1
Large text has a contrast ratio of at least 4.5:1
WCAG Success Criterion 1.4.7 Low or No Background Audio
Level AAA
For prerecorded audio-only content that (1) contains primarily speech in the foreground, (2) is not an audio CAPTCHA or audio logo, and (3) is not vocalization intended to be primarily musical expression such as singing or rapping, at least one of the following is true:
No Background
The audio does not contain background sounds.
Turn Off
The background sounds can be turned off.
20 dB
The background sounds are at least 20 decibels lower than the foreground speech content, with the exception of occasional sounds that last for only one or two seconds.
WCAG Success Criterion 1.4.8 Visual Presentation
Level AAA
For the visual presentation of blocks of text, a mechanism is available to achieve the following:
- Foreground and background colors can be selected by the user.
- Width is no more than 80 characters or glyphs (40 if CJK).
- Text is not justified (aligned to both the left and the right margins).
- Line spacing (leading) is at least space-and-a-half within paragraphs, and paragraph spacing is at least 1.5 times larger than the line spacing.
- Text can be resized without assistive technology up to 200 percent in a way that does not require the user to scroll horizontally to read a line of text on a full-screen window.
WCAG Success Criterion 1.4.9 Images of Text (No Exception)
Level AAA
Images of text are only used for pure decoration or where a particular presentation of text is essential to the information being conveyed.
WCAG Success Criterion 1.4.10 Reflow
Level AA
Content can be presented without loss of information or functionality, and without requiring scrolling in two dimensions for:
Vertical scrolling content at a width equivalent to 320 CSS pixels;
Horizontal scrolling content at a height equivalent to 256 CSS pixels.
WCAG Success Criterion 1.4.11 Non-text Contrast
Level AA
The visual presentation of UI components/states and the parts of graphics required to understand the content have a contrast ratio of at least 3:1 against adjacent color(s)
WCAG 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.
WCAG Success Criterion 1.4.13 Content on Hover or Focus
Level AA
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.
WCAG Success Criterion 2.1.1 Keyboard
Level A
All functionality of the content is operable through a keyboard interface without requiring specific timings for individual keystrokes
exceptions for functions that depend on user’s movement or path (drawing, etc.)
WCAG Success Criterion 2.1.2 No Keyboard Trap
Level A
If keyboard focus can be moved to a component of the page using a keyboard interface, then focus can be moved away from that component using only a keyboard interface, and, if it requires more than unmodified arrow or tab keys or other standard exit methods, the user is advised of the method for moving focus away.