Images that do not convey content, are decorative, or contain content that is already conveyed in text are given null alt text (alt="") or implemented as CSS backgrounds. All linked images have descriptive alternative text.
Claim
Add Task
A
Equivalent alternatives to complex images are provided in context or on a separate linked page.
A transcript or audio description is provided for non-live video. (NOTE: Only required if there is relevant visual content that is not presented in the audio.)
Audio descriptions are provided for non-live video. (NOTE: Only required if there is relevant visual content that is not presented in the audio. Also, while not required at Level AA, for optimal accessibility WebAIM recommends transcripts in addition to audio descriptions.)
When audio description cannot be added to video due to audio timing (e.g., insufficient pauses in the audio), an alternative version of the video with pauses that allow audio descriptions is provided.
A transcript is provided for pre-recorded media that has a video track. For optimal accessibility, WebAIM strongly recommends transcripts for all multimedia.
is used to designate headings (<h1>), regions/landmarks, lists (<ul>, <ol>, and <dl>), emphasized or special text (<strong>, <code>, <abbr>, <blockquote>, for example), etc. Semantic markup is used appropriately.
are associated with form input elements. Related form elements are grouped with fieldset/legend. ARIA labelling may be used when standard HTML is insufficient.
Instructions do not rely upon shape, size, or visual location (e.g., "Click the square icon to continue" or "Instructions are in the right-hand column").
Claim
Add Task
A
Instructions do not rely upon sound (e.g., "A beeping sound indicates you may continue.").
between the link and the surrounding text is at least 3:1 and an additional distinction (e.g., it becomes underlined) is provided when the link is hovered over and receives focus.
No loss of content or functionality occurs and horizontal scrolling is avoided when content is presented at a width of 320 pixels. This requires responsive design for most web sites. This is best tested by setting the browser window to 1280 pixels wide and then zooming the page content to 400%.
Claim
Add Task
AA
Content that requires horizontal scrolling, such as data tables, complex images (such as maps and charts), toolbars, etc. are exempted.
A contrast ratio of at least 3:1 is present for differentiating graphical objects (such as icons and components of charts or graphs) and author-customized interface components (such as buttons, form controls, and focus indicators/outlines).
Claim
Add Task
AA
At least 3:1 contrast must be provided in the various states (focus, hover, active, etc.) of author-customized interactive components.
No loss of content or functionality occurs when the user adapts paragraph spacing to 2 times the font size, text line height/spacing to 1.5 times the font size, word spacing to .16 times the font size, and letter spacing to .12 times the font size.
Claim
Add Task
AA
This is best supported by avoiding pixel height definitions for elements that contain text.
When additional content is presented on hover or keyboard focus. the newly revealed content can be dismissed (generally via the Esc key) without moving the pointer or keyboard focus, unless the content presents an input error or does not obscure or interfere with other page content.
Claim
Add Task
AA
When additional content is presented on hover or keyboard focus, the pointer can be moved to the new content without the content disappearing.
Claim
Add Task
AA
When additional content is presented on hover or keyboard focus, the new content must remain visible until the pointer or keyboard focus is moved away from the triggering control, the new content is dismissed, or the new content is no longer relevant.
Blocks of text over one sentence in length are no more than 80 characters wide.
Claim
Add Task
AAA
Blocks of text over one sentence in length are NOT fully justified (aligned to both the left and the right margins).
Claim
Add Task
AAA
Blocks of text over one sentence in length have adequate line spacing (at least 1/2 the height of the text) and paragraph spacing (1.5 times line spacing).
Claim
Add Task
AAA
Blocks of text over one sentence in length have a specified foreground and background color. These can be applied to specific elements or to the entire page using CSS (and thus inherited by all other elements).
Claim
Add Task
AAA
Blocks of text over one sentence in length do NOT require horizontal scrolling when the text size is doubled.
If a keyboard shortcut uses printable character keys, then the user must be able to disable the key command, change the defined key to a non-printable key (Ctrl, Alt, etc.), or only activate the shortcut when an associated interface component or button is focused.
If a page or application has a time limit, the user is given options to turn off, adjust, or extend that time limit. This is not a requirement for real-time events (e.g., an auction), where the time limit is absolutely required, or if the time limit is longer than 20 hours.
Automatically moving, blinking, or scrolling content (such as carousels, marquees, or animations) that lasts longer than 5 seconds can be paused, stopped, or hidden by the user.
Claim
Add Task
A
Automatically updating content (e.g., a dynamically-updating news ticker, chat messages, etc.) can be paused, stopped, or hidden by the user or the user can manually control the timing of the updates.
A link is provided to skip navigation and other page elements that are repeated across web pages.
Claim
Add Task
A
A proper heading structure and/or identification of page regions/landmarks may be considered a sufficient technique. Because navigating by headings or regions is not supported in most browsers, WebAIM recommends a "skip" link (in addition to headings and regions) to best support sighted keyboard users.