sidereior/wcg-standards-adherence huggingface dataset:
Each version should be as conformant as possible. One version would
      need to be fully conformant in order to meet conformance requirement 1 . Note 5 The conforming alternative version does not need to reside within the scope of conformance,
      or even on the same Web site, as long as it is as freely available as the non-conforming
      version. Note 6 Alternate versions should not be confused with supplementary content , which support the original page and enhance comprehension. Note 7 Setting user preferences within the content to produce a conforming version is an
      acceptable mechanism for reaching another version as long as the method used to set
      the preferences is accessibility supported.
See Understanding Conforming Alternate Versions content (Web content) information and sensory experience to be communicated to the user by means of a user agent , including code or markup that defines the content's structure , presentation , and interactions context-sensitive help help text that provides information related to the function currently being performed Note Clear labels can act as context-sensitive help. contrast ratio (L1 + 0.05) / (L2 + 0.05), where L1 is the relative luminance of the lighter of the colors, and L2 is the relative luminance of the darker of the colors. Note 1 Contrast ratios can range from 1 to 21 (commonly written 1:1 to 21:1). Note 2 Because authors do not have control over user settings as to how text is rendered
      (for example font smoothing or anti-aliasing), the contrast ratio for text can be
      evaluated with anti-aliasing turned off. Note 3 For the purpose of Success Criteria 1.4.3 and 1.4.6, contrast is measured with respect
      to the specified background over which the text is rendered in normal usage.
If no
      background color is specified, then white is assumed. Note 4 Background color is the specified color of content over which the text is to be rendered
      in normal usage. It is a failure if no background color is specified when the text
      color is specified, because the user's default background color is unknown and cannot
      be evaluated for sufficient contrast. For the same reason, it is a failure if no text
      color is specified when a background color is specified. Note 5 When there is a border around the letter, the border can add contrast and would be
      used in calculating the contrast between the letter and its background.
A narrow border
      around the letter would be used as the letter. A wide border around the letter that
      fills in the inner details of the letters acts as a halo and would be considered background. Note 6 WCAG conformance should be evaluated for color pairs specified in the content that
      an author would expect to appear adjacent in typical presentation. Authors need not
      consider unusual presentations, such as color changes made by the user agent, except
      where caused by authors' code. correct reading sequence any sequence where words and paragraphs are presented in an order that does not change
      the meaning of the content CSS pixel visual angle of about 0.0213 degrees A CSS pixel is the canonical unit of measure for all lengths and measurements in CSS.
      This unit is density-independent, and distinct from actual hardware pixels present
      in a display.
User agents and operating systems should ensure that a CSS pixel is
      set as closely as possible to the CSS Values and Units Module Level 3 reference pixel [ css3-values ], which takes into account the physical dimensions of the display
      and the assumed viewing distance (factors that cannot be determined by content authors). down-event platform event that occurs  when the trigger stimulus of a pointer is depressed The down-event may have different names on different platforms, such as "touchstart" or "mousedown". dragging movement [New] an operation where the pointer engages with an element on the down-event and the element (or a representation of its position) follows the pointer until an up-event Note Examples of draggable elements include list items, text elements, and images. emergency a sudden, unexpected situation or occurrence that requires immediate action to preserve
      health, safety, or property encloses [New] solidly bounds or surrounds essential if removed, would fundamentally change the information or functionality of the content, and information and functionality cannot be achieved in another way that would conform extended audio description audio description that is added to an audiovisual presentation by pausing the video so that there is time to add additional description Note This technique is only used when the sense of the video would be lost without the additional audio description and the pauses between dialogue/narration are too short. flash a pair of opposing changes in relative luminance that can cause seizures in some people if it is large enough and in the right frequency
      range Note 1 See general flash and red flash thresholds for information about types of flash that are not allowed.
Note 2 See also blinking . focus indicator [New] pixels that are changed to visually indicate when a user interface component is in a focused state functionality processes and outcomes achievable through user action general flash and red flash thresholds a flash or rapidly changing image sequence is below the threshold (i.e., content passes ) if any of the following are true: there are no more than three general flashes and / or no more than three red flashes within any one-second period; or the combined area of flashes occurring concurrently occupies no more than a total
         of .006 steradians within any 10 degree visual field on the screen (25% of any 10
         degree visual field on the screen) at typical viewing distance where: A general flash is defined as a pair of opposing changes in relative luminance of 10% or more of the maximum relative luminance (1.0) where the relative luminance of
         the darker image is below 0.80; and where "a pair of opposing changes" is an increase
         followed by a decrease, or a decrease followed by an increase, and A red flash is defined as any pair of opposing transitions involving a saturated red Exception: Flashing that is a fine, balanced, pattern such as white noise or an alternating
      checkerboard pattern with "squares" smaller than 0.1 degree (of visual field at typical
      viewing distance) on a side does not violate the thresholds. Note 1 For general software or Web content, using a 341 x 256 pixel rectangle anywhere on the displayed screen area when the content is viewed at 1024 x 768 pixels will provide a good estimate of a 10 degree visual field for standard screen sizes and viewing distances (e.g., 15-17 inch screen at 22-26 inches). This resolution of 75 - 85 ppi is known to be lower, and thus more conservative than the nominal CSS pixel resolution of 96 ppi in CSS specifications. Higher resolutions displays showing the same rendering of the content yield smaller and safer images so it is lower resolutions that are used to define the thresholds.
Note 2 A transition is the change in relative luminance (or relative luminance/color for
      red flashing) between adjacent peaks and valleys in a plot of relative luminance (or
      relative luminance/color for red flashing) measurement against time. A flash consists
      of two opposing transitions. Note 3 The new working definition in the field for "pair of opposing transitions involving a saturated red" (from WCAG 2.2) is a pair of opposing transitions where, one transition is either to or from a state with a value R/(R + G + B) that is greater than or equal to 0.8, and the difference between states is more than 0.2 (unitless) in the CIE 1976 UCS chromaticity diagram. [ ISO_9241-391 ] Note 4 Tools are available that will carry out analysis from video screen capture. However,
      no tool is necessary to evaluate for this condition if flashing is less than or equal
      to 3 flashes in any one second.
Content automatically passes (see #1 and #2 above). human language language that is spoken, written or signed (through visual or tactile means) to communicate
      with humans Note See also sign language . idiom phrase whose meaning cannot be deduced from the meaning of the individual words and
      the specific words cannot be changed without losing the meaning Note Idioms cannot be translated directly, word for word, without losing their (cultural
      or language-dependent) meaning. Example 1 In English, "spilling the beans" means "revealing a secret." However, "knocking over
      the beans" or "spilling the vegetables" does not mean the same thing. Example 2 In Japanese, the phrase " さじを投げる " literally translates into "he throws a spoon," but it means that there is nothing
      he can do and finally he gives up.
Example 3 In Dutch, " Hij ging met de kippen op stok " literally translates into "He went to roost with the chickens," but it means that
      he went to bed early. image of text text that has been rendered in a non-text form (e.g., an image) in order to achieve
      a particular visual effect Note This does not include text that is part of a picture that contains significant other visual content. Example A person's name on a nametag in a photograph. informative for information purposes and not required for conformance Note Content required for conformance is referred to as " normative ." input error information provided by the user that is not accepted Note This includes: Information that is required by the Web page but omitted by the user Information that is provided by the user but that falls outside the required data
         format or values jargon words used in a particular way by people in a particular field Example The word StickyKeys is jargon from the field of assistive technology/accessibility. keyboard interface interface used by software to obtain keystroke input Note 1 A keyboard interface allows users to provide keystroke input to programs even if the
        native technology does not contain a keyboard.
Example A touchscreen PDA has a keyboard interface built into its operating system as well
        as a connector for external keyboards. Applications on the PDA can use the interface
        to obtain keyboard input either from an external keyboard or from other applications
        that provide simulated keyboard output, such as handwriting interpreters or speech-to-text
        applications with "keyboard emulation" functionality. Note 2 Operation of the application (or parts of the application) through a keyboard-operated
      mouse emulator, such as MouseKeys, does not qualify as operation through a keyboard
      interface because operation of the program is through its pointing device interface,
      not through its keyboard interface. keyboard shortcut alternative means of triggering an action by the pressing of one or more keys label text or other component with a text alternative that is presented to a user to identify a component within Web content Note 1 A label is presented to all users whereas the name may be hidden and only exposed by assistive technology. In many (but not all) cases
      the name and the label are the same.
Note 2 The term label is not limited to the label element in HTML. large scale (text) with at least 18 point or 14 point bold or font size that would yield equivalent size
      for Chinese, Japanese and Korean (CJK) fonts Note 1 Fonts with extraordinarily thin strokes or unusual features and characteristics that
      reduce the familiarity of their letter forms are harder to read, especially at lower
      contrast levels. Note 2 Font size is the size when the content is delivered. It does not include resizing
      that may be done by a user. Note 3 The actual size of the character that a user sees is dependent both on the author-defined
      size and the user's display or user agent settings.
For many mainstream body text
      fonts, 14 and 18 point is roughly equivalent to 1.2 and 1.5 em or to 120% or 150%
      of the default size for body text (assuming that the body font is 100%), but authors
      would need to check this for the particular fonts in use. When fonts are defined in
      relative units, the actual point size is calculated by the user agent for display.
      The point size should be obtained from the user agent, or calculated based on font
      metrics as the user agent does, when evaluating this success criterion. Users who
      have low vision would be responsible for choosing appropriate settings. Note 4 When using text without specifying the font size, the smallest font size used on major
      browsers for unspecified text would be a reasonable size to assume for the font. If
      a level 1 heading is rendered in 14pt bold or higher on major browsers, then it would
      be reasonable to assume it is large text.
Relative scaling can be calculated from
      the default sizes in a similar fashion. Note 5 The 18 and 14 point sizes for roman texts are taken from the minimum size for large
      print (14pt) and the larger standard font size (18pt). For other fonts such as CJK
      languages, the "equivalent" sizes would be the minimum large print size used for those
      languages and the next larger standard large print size. legal commitments transactions where the person incurs a legally binding obligation or benefit Example A marriage license, a stock trade (financial and legal), a will, a loan, adoption,
      signing up for the army, a contract of any type, etc. link purpose nature of the result obtained by activating a hyperlink live information captured from a real-world event and transmitted to the receiver with
      no more than a broadcast delay Note 1 A broadcast delay is a short (usually automated) delay, for example used in order
      to give the broadcaster time to cue or censor the audio (or video) feed, but not sufficient
      to allow significant editing.
Note 2 If information is completely computer generated, it is not live. lower secondary education level the two or three year period of education that begins after completion of six years
      of school and ends nine years after the beginning of primary education Note This definition is based on the International Standard Classification of Education
      [ UNESCO ]. mechanism process or technique for achieving a result Note 1 The mechanism may be explicitly provided in the content, or may be relied upon to be provided by either the platform or by user agents , including assistive technologies . Note 2 The mechanism needs to meet all success criteria for the conformance level claimed. media alternative for text media that presents no more information than is already presented in text (directly
      or via text alternatives) Note A media alternative for text is provided for those who benefit from alternate representations
      of text.
Media alternatives for text may be audio-only, video-only (including sign-language
      video), or audio-video. motion animation addition of steps between conditions to create the illusion of movement or to give a sense of a smooth transition Example For example, an element which moves into place or changes size while appearing is considered to be animated. An element which appears instantly without transitioning is not using animation. Motion animation does not include changes of color, blurring, or opacity which do not change the perceived size, shape, or position of the element. minimum bounding box [New] the smallest enclosing rectangle aligned to the horizontal axis within which all the points of a shape lie.
For components which wrap onto multiple lines as part of a sentence or block of text (such as hypertext links), the bounding box is based on how the component would appear on a single line. name text by which software can identify a component within Web content to the user Note 1 The name may be hidden and only exposed by assistive technology, whereas a label is presented to all users. In many (but not all) cases, the label and the name are
      the same. Note 2 This is unrelated to the name attribute in HTML. navigated sequentially navigated in the order defined for advancing focus (from one element to the next)
      using a keyboard interface non-text content any content that is not a sequence of characters that can be programmatically determined or where the sequence is not expressing something in human language Note This includes ASCII Art (which is a pattern of characters), emoticons, leetspeak (which uses character substitution),
      and images representing text normative required for conformance Note 1 One may conform in a variety of well-defined ways to this document.
Note 2 Content identified as " informative " or "non-normative" is never required for conformance . on a full-screen window on the most common sized desktop/laptop display with the viewport maximized Note Since people generally keep their computers for several years, it is best not to rely
      on the latest desktop/laptop display resolutions but to consider the common desktop/laptop
      display resolutions over the course of several years when making this evaluation. paused stopped by user request and not resumed until requested by user perimeter [New] continuous line forming the boundary of a shape not including shared pixels, or the minimum bounding box , whichever is shortest. Example The perimeter calculation for a 2 CSS pixel perimeter around a rectangle is 4 h +4 w , where h is the height and w is the width. For a 2 CSS pixel perimeter around a circle it is 4𝜋 r .
pointer input input from a device that can target a specific coordinate (or set of coordinates) on a screen,
      such as a mouse, pen, or touch contact Note See the Pointer Events
      definition for "pointer" [ pointerevents ]. prerecorded information that is not live presentation rendering of the content in a form to be perceived by users primary education level six year time period that begins between the ages of five and seven, possibly without
      any previous education Note This definition is based on the International Standard Classification of Education
      [ UNESCO ]. process series of user actions where each action is required in order to complete an activity Example 1 Successful use of a series of Web pages on a shopping site requires users to view
      alternative products, prices and offers, select products, submit an order, provide
      shipping information and provide payment information. Example 2 An account registration page requires successful completion of a Turing test before
      the registration form can be accessed. programmatically determined (programmatically determinable) determined by software from author-supplied data provided in a way that different user agents , including assistive technologies , can extract and present this information to users in different modalities Example 1 Determined in a markup language from elements and attributes that are accessed directly
      by commonly available assistive technology.
Example 2 Determined from technology-specific data structures in a non-markup language and exposed
      to assistive technology via an accessibility API that is supported by commonly available
      assistive technology. programmatically determined link context additional information that can be programmatically determined from relationships with a link, combined with the link text, and presented to users in different modalities Example In HTML, information that is programmatically determinable from a link in English
      includes text that is in the same paragraph, list, or table cell as the link or in
      a table header cell that is associated with the table cell that contains the link. Note Since screen readers interpret punctuation, they can also provide the context from
      the current sentence, when the focus is on a link in that sentence. programmatically set set by software using methods that are supported by user agents, including assistive
      technologies pure decoration serving only an aesthetic purpose, providing no information, and having no functionality Note Text is only purely decorative if the words can be rearranged or substituted without
      changing their purpose. Example The cover page of a dictionary has random words in very light text in the background.
real-time event event that a) occurs at the same time as the viewing and b) is not completely generated
      by the content Example 1 A Webcast of a live performance (occurs at the same time as the viewing and is not
      prerecorded). Example 2 An on-line auction with people bidding (occurs at the same time as the viewing). Example 3 Live humans interacting in a virtual world using avatars (is not completely generated
      by the content and occurs at the same time as the viewing). region perceivable, programmatically determined section of content Note In HTML, any area designated with a landmark role would be a region. relationships meaningful associations between distinct pieces of content relative luminance the relative brightness of any point in a colorspace, normalized to 0 for darkest
      black and 1 for lightest white Note 1 For the sRGB colorspace, the relative luminance of a color is defined as L = 0.2126
      * R + 0.7152 * G + 0.0722 * B where R , G and B are defined as: if RsRGB <= 0.04045 then R = RsRGB/12.92 else R = ((RsRGB+0.055)/1.055) ^ 2.4 if GsRGB <= 0.04045 then G = GsRGB/12.92 else G = ((GsRGB+0.055)/1.055) ^ 2.4 if BsRGB <= 0.04045 then B = BsRGB/12.92 else B = ((BsRGB+0.055)/1.055) ^ 2.4 and RsRGB, GsRGB, and BsRGB are defined as: RsRGB = R8bit/255 GsRGB = G8bit/255 BsRGB = B8bit/255 The "^" character is the exponentiation operator.
(Formula taken from 
      [ SRGB ].) Note 2 Before May 2021 the value of 0.04045 in the definition was different (0.03928). It was taken from an older version of the specification and has been updated. It has no practical effect on the calculations in the context of these guidelines. Note 3 Almost all systems used today to view Web content assume sRGB encoding. Unless it
      is known that another color space will be used to process and display the content,
      authors should evaluate using sRGB colorspace.
If using other color spaces, see Understanding Success Criterion 1.4.3 . Note 4 If dithering occurs after delivery, then the source color value is used. For colors
      that are dithered at the source, the average values of the colors that are dithered
      should be used (average R, average G, and average B). Note 5 Tools are available that automatically do the calculations when testing contrast and
      flash. Note 6 A separate page giving the relative luminance definition using MathML to display the formulas is available.
relied upon (technologies that are) the content would not conform if that technology is turned off or is not supported role text or number by which software can identify the function of a component within Web
      content Example A number that indicates whether an image functions as a hyperlink, command button,
      or check box. same functionality same result when used Example A submit "search" button on one Web page and a "find" button on another Web page may
      both have a field to enter a term and list topics in the Web site related to the term
      submitted. In this case, they would have the same functionality but would not be labeled
      consistently. same relative order same position relative to other items Note Items are considered to be in the same relative order even if other items are inserted
      or removed from the original order. For example, expanding navigation menus may insert
      an additional level of detail or a secondary navigation section may be inserted into
      the reading order.
satisfies a success criterion the success criterion does not evaluate to 'false' when applied to the page section a self-contained portion of written content that deals with one or more related topics
      or thoughts Note A section may consist of one or more paragraphs and include graphics, tables, lists
      and sub-sections. set of web pages collection of web pages that share a common purpose and that are created by the same author, group or organization Example Examples include: a publication which is split across multiple Web pages, where each page contains one chapter or other significant section of the work. The publication is logically a single contiguous unit, and contains navigation features that enable access to the full set of pages. an e-commerce website shows products in a set of Web pages that all share the same navigation and identification. However, when progressing to the checkout process, the template changes; the navigation and other elements are removed, so the pages in that process are functionally and visually different.
The checkout pages are not part of the set of product pages. a blog on a sub-domain (e.g. blog.example.com) which has a different navigation and is authored by a distinct set of people from the pages on the primary domain (example.com). Note Different language versions would be considered different sets of Web pages. sign language a language using combinations of movements of the hands and arms, facial expressions,
      or body positions to convey meaning sign language interpretation translation of one language, generally a spoken language, into a sign language Note True sign languages are independent languages that are unrelated to the spoken language(s)
      of the same country or region.
single pointer pointer input that operates with one point of contact with the screen, including single taps and clicks, double-taps and clicks, long presses, and path-based gestures specific sensory experience a sensory experience that is not purely decorative and does not primarily convey important
      information or perform a function Example Examples include a performance of a flute solo, works of visual art etc. state dynamic property expressing characteristics of a user interface component that may change in response to user action or automated processes States do not affect the nature of the component, but represent data associated with the component or user interaction possibilities. Examples include focus, hover, select, press, check, visited/unvisited, and expand/collapse. status message change in content that is not a change of context , and that provides information to the user on the success or results of an action, on the waiting state of an application, on the progress of a process, or on the existence of errors structure The way the parts of a Web page are organized in relation to each other; and The way a collection of Web pages is organized style property property whose value determines the presentation (e.g. font, color, size, location, padding, volume, synthesized speech prosody) of
 content elements as they are rendered (e.g.
onscreen, via loudspeaker, via braille display) by user agents Style properties can have several origins: User agent default styles: The default style property values applied in the absence of any author or user styles. Some web content technologies specify a default rendering, others do not; Author styles: Style property values that are set by the author as part of the content (e.g. in-line styles, author style
sheets); User styles: Style property values that are set by the user (e.g. via user agent interface settings, user style sheets) supplemental content additional content that illustrates or clarifies the primary content Example 1 An audio version of a Web page . Example 2 An illustration of a complex process .
Example 3 A paragraph summarizing the major outcomes and recommendations made in a research
      study. synchronized media audio or video synchronized with another format for presenting information and/or with time-based
      interactive components, unless the media is a media alternative for text that is clearly labeled as such target region of the display that will accept a pointer action, such as the interactive area of a user interface component Note If two or more targets are overlapping, the overlapping area should not be included in the measurement of the target size, except when the overlapping targets perform the same action or open the same page. technology (Web content) mechanism for encoding instructions to be rendered, played or executed by user agents Note 1 As used in these guidelines "Web Technology" and the word "technology" (when used
      alone) both refer to Web Content Technologies. Note 2 Web content technologies may include markup languages, data formats, or programming
      languages that authors may use alone or in combination to create end-user experiences
      that range from static Web pages to synchronized media presentations to dynamic Web
      applications. Example Some common examples of Web content technologies include HTML, CSS, SVG, PNG, PDF,
      Flash, and JavaScript.
text sequence of characters that can be programmatically determined , where the sequence is expressing something in human language text alternative Text that is programmatically associated with non-text content or referred to from text that is programmatically associated with non-text content.
      Programmatically associated text is text whose location can be programmatically determined
      from the non-text content. Example An image of a chart is described in text in the paragraph after the chart. The short
      text alternative for the chart indicates that a description follows. Note Refer to Understanding Text Alternatives for more information. up-event platform event that occurs  when the trigger stimulus of a pointer is released The up-event may have different names on different platforms, such as "touchend" or "mouseup".
used in an unusual or restricted way words used in such a way that requires users to know exactly which definition to apply
      in order to understand the content correctly Example The term "gig" means something different if it occurs in a discussion of music concerts
      than it does in article about computer hard drive space, but the appropriate definition
      can be determined from context. By contrast, the word "text" is used in a very specific
      way in WCAG 2.1, so a definition is supplied in the glossary. user agent any software that retrieves and presents Web content for users Example Web browsers, media players, plug-ins, and other programs — including assistive technologies — that help in retrieving, rendering, and interacting with Web content. user-controllable data that is intended to be accessed by users Note This does not refer to such things as Internet logs and search engine monitoring data. Example Name and address fields for a user's account.
user interface component a part of the content that is perceived by users as a single control for a distinct
      function Note 1 Multiple user interface components may be implemented as a single programmatic element.
      "Components" here is not tied to programming techniques, but rather to what the user
      perceives as separate controls. Note 2 User interface components include form elements and links as well as components generated
      by scripts. Note 3 What is meant by "component" or "user interface component" here is also sometimes
      called "user interface element". Example An applet has a "control" that can be used to move through content by line or page
      or random access. Since each of these would need to have a name and be settable independently,
      they would each be a "user interface component." user inactivity any continuous period of time where no user actions occur The method of tracking will be determined by the web site or application.
video the technology of moving or sequenced pictures or images Note Video can be made up of animated or photographic images, or both. video-only a time-based presentation that contains only video (no audio and no interaction) viewport object in which the user agent presents content Note 1 The user agent presents content through one or more viewports. Viewports include windows, frames,
      loudspeakers, and virtual magnifying glasses. A viewport may contain another viewport
      (e.g., nested frames). Interface components created by the user agent such as prompts,
      menus, and alerts are not viewports.
Note 2 This definition is based on User Agent Accessibility Guidelines 1.0 Glossary [ UAAG10 ]. visually customized the font, size, color, and background can be set Web page a non-embedded resource obtained from a single URI using HTTP plus any other resources
      that are used in the rendering or intended to be rendered together with it by a user agent Note 1 Although any "other resources" would be rendered together with the primary resource,
      they would not necessarily be rendered simultaneously with each other. Note 2 For the purposes of conformance with these guidelines, a resource must be "non-embedded"
      within the scope of conformance to be considered a Web page. Example 1 A Web resource including all embedded images and media. Example 2 A Web mail program built using Asynchronous JavaScript and XML (AJAX).
The program
      lives entirely at http://example.com/mail, but includes an inbox, a contacts area
      and a calendar. Links or buttons are provided that cause the inbox, contacts, or calendar
      to display, but do not change the URI of the page as a whole. Example 3 A customizable portal site, where users can choose content to display from a set of
      different content modules. Example 4 When you enter "http://shopping.example.com/" in your browser, you enter a movie-like
      interactive shopping environment where you visually move around in a store dragging
      products off of the shelves around you and into a visual shopping cart in front of
      you. Clicking on a product causes it to be demonstrated with a specification sheet
      floating alongside.
Errata fixes to WCAG 2.1 have also been incorporated into WCAG 2.2. The full commit history to WCAG 2.2 is available. 2019-11-10: Promoted Focus Visible from Level AA to Level A. 2020-01-14: Added Focus Visible (Enhanced) , later renamed to Focus Appearance (Enhanced), later removed. 2020-03-10: Renamed Pointer Target Spacing to Target Size (Minimum) 2020-03-30: Added Accessible Authentication (Minimum) .
2020-05-27: Added Dragging (later renamed Dragging Movements ). 2020-07-19: Added Findable Help (later renamed to Consistent Help ), Fixed Reference Points (Page Break Navigation), Hidden Controls (later renamed Visible Controls), Pointer Target Spacing (later renamed Target Size (Minimum) ), Redundant Entry . 2020-08-04: Added Focus Appearance (Minimum) (later renamed to Focus Appearance ) and renamed Focus Visible (Enhanced) to Focus Appearance (Enhanced) . 2020-11-02: Renamed Dragging to Dragging Movements . 2020-12-08: Renamed Hidden Controls to Visible Controls.
2023-06-05: Added privacy and security sections within conformance. B. Acknowledgments This section is non-normative. Additional information about participation in the Accessibility Guidelines Working
            Group (AG WG) can be found on the Working Group home page . B.1 Participants of the AG WG active in the development of this document: Jake Abma (Invited Expert) Shadi Abou-Zahra (Amazon) Chuck Adams (Oracle Corporation) Amani Ali (Nomensa) Jim Allan (Invited Expert) Jon Avila (Level Access) Bruce Bailey (U.S.
Kasday, Kazuhito Kidachi, Ken Kipness, Johannes Koch, Marja-Riitta Koivunen, Maureen Kraft, Preety Kumar, Kristjan Kure, Andrew LaHart, Gez Lemon, Chuck Letourneau, Aurélien Levy, Harry Loots, Scott Luebking, Tim Lacy, Jim Ley, Alex Li, William Loughborough, N Maffeo, Mark Magennis, Erich Manser, Kapsi Maria, Luca Mascaro, Matt May, Sheena McCullagh, Liam McGee, Jens Oliver Meiert, Niqui Merret, Jonathan Metz, Alessandro Miele, Steven Miller, Mathew J Mirabella, Matt May, Marti McCuller, Sorcha Moore, Charles F. Munat, Robert Neff, Charles Nevile, Liddy Nevile, Dylan Nicholson, Bruno von Niman, Tim Noonan, Sebastiano Nutarelli, Graham Oliver, Sean B. Palmer, Charu Pandhi, evarshi Pant, Nigel Peck, Anne Pemberton, David Poehlman, Ian Pouncey, Charles Pritchard, Kerstin Probiesch, W Reagan, Adam Victor Reed, Chris Reeve, Chris Ridpath, Lee Roberts, Mark Rogers, Raph de Rooij, Gregory J. Rosmaita, Matthew Ross, Sharron Rush, Joel Sanda, Janina Sajka, Roberto Scano, Gordon Schantz, Tim van Schie, Wolf Schmidt, Stefan Schnabel, Cynthia Shelly, Glenda Sims, John Slatin, Becky Smith, Jared Smith, Andi Snow-Weaver, Neil Soiffer, Mike Squillace, Michael Stenitzer, Diane Stottlemyer, Christophe Strobbe, Sarah J Swierenga, Jim Thatcher, Terry Thompson, Justin Thorp, David Todd, Mary Utt, Jean Vanderdonckt, Carlos A Velasco, Eric Velleman, Gijs Veyfeyken, Dena Wainwright, Paul Walsch, Daman Wandke, Richard Warren, Elle Waters, Takayuki Watanabe, Gian Wild, David Wooley, Wu Wei, Kenny Zhang, Leona Zumbo. B.3 Enabling funders This publication has been funded in part with U.S.
Federal funds from the Health and Human Services, National Institute on Disability, Independent Living, and Rehabilitation Research (NIDILRR), initially under contract number ED-OSE-10-C-0067, then under contract number HHSP23301500054C, and now under HHS75P00120P00168. The content of this publication does not necessarily reflect the views or policies of the U.S. Department of Health and Human Services or the U.S. Department of Education, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
URL: https://html.spec.whatwg.org/multipage/ [ISO_9241-391] Ergonomics of human-system interaction—Part 391: Requirements, analysis and compliance test methods for the reduction of photosensitive seizures . International Standards Organization. URL: https://www.iso.org/standard/56350.html [pointerevents] Pointer Events . Jacob Rossi; Matt Brubeck. W3C.
21 September 2023. W3C Recommendation. URL: https://www.w3.org/TR/WCAG21/ ↑ Permalink Referenced in: § 3.1.4 Abbreviations Permalink Referenced in: § 2.5.4 Motion Actuation § 5. Conformance § 5.2.4 Only Accessibility-Supported Ways of Using Technologies § 5.2.5 Non-Interference § 5.5 Statement of Partial Conformance - Language § 6. Glossary Permalink Referenced in: § 1.2.1 Audio-only and Video-only (Prerecorded) § 1.2.3 Audio Description or Media Alternative (Prerecorded) § 1.2.8 Media Alternative (Prerecorded) § 1.2.9 Audio-only (Live) Permalink Referenced in: § 2.4.4 Link Purpose (In Context) § 2.4.9 Link Purpose (Link Only) Permalink Referenced in: § 6.
Glossary Permalink Referenced in: § 1.1.1 Non-text Content § 1.4.4 Resize Text § 4.1.2 Name, Role, Value § 4.1.3 Status Messages § 6. Glossary (2) (3) (4) Permalink Referenced in: § 1.2.2 Captions (Prerecorded) § 1.2.4 Captions (Live) § 1.2.6 Sign Language (Prerecorded) § 6. Glossary (2) (3) (4) Permalink Referenced in: § 1.2.3 Audio Description or Media Alternative (Prerecorded) § 1.2.5 Audio Description (Prerecorded) § 1.2.7 Extended Audio Description (Prerecorded) § 6. Glossary (2) Permalink Referenced in: § 1.2.1 Audio-only and Video-only (Prerecorded) § 1.2.9 Audio-only (Live) § 1.4.7 Low or No Background Audio Permalink Referenced in: § 2.2.2 Pause, Stop, Hide § 6. Glossary Permalink Referenced in: § 1.4.8 Visual Presentation Permalink Referenced in: § 1.1.1 Non-text Content § 1.4.7 Low or No Background Audio Permalink Referenced in: § 1.2.2 Captions (Prerecorded) § 1.2.4 Captions (Live) § 1.4.4 Resize Text Permalink Referenced in: § 3.2.1 On Focus § 3.2.2 On Input § 3.2.5 Change on Request § 6.
Glossary Permalink Referenced in: § 3.3.8 Accessible Authentication (Minimum) § 3.3.9 Accessible Authentication (Enhanced) Permalink Referenced in: § 5. Conformance § 5.2.2 Full pages § 6. Glossary (2) (3) Permalink Referenced in: § 5.2.1 Conformance Level Permalink Referenced in: § 2.4.13 Focus Appearance § 6. Glossary (2) (3) (4) Permalink Referenced in: § 3.3.5 Help Permalink Referenced in: § 1.4.3 Contrast (Minimum) § 1.4.6 Contrast (Enhanced) § 1.4.11 Non-text Contrast Permalink Referenced in: § 1.3.2 Meaningful Sequence Permalink Referenced in: § 1.4.10 Reflow (2) § 2.4.13 Focus Appearance § 2.5.5 Target Size (Enhanced) § 2.5.8 Target Size (Minimum) Permalink Referenced in: § 2.5.2 Pointer Cancellation § 6. Glossary Permalink Referenced in: § 2.5.7 Dragging Movements Permalink Referenced in: § 2.2.4 Interruptions Permalink Referenced in: Not referenced in this document.
Permalink Referenced in: § 1.3.4 Orientation § 1.4.5 Images of Text § 1.4.9 Images of Text (No Exception) § 1.4.11 Non-text Contrast § 2.2.1 Timing Adjustable § 2.2.2 Pause, Stop, Hide § 2.2.3 No Timing § 2.3.3 Animation from Interactions § 2.5.1 Pointer Gestures § 2.5.2 Pointer Cancellation § 2.5.4 Motion Actuation § 2.5.5 Target Size (Enhanced) § 2.5.6 Concurrent Input Mechanisms § 2.5.7 Dragging Movements § 2.5.8 Target Size (Minimum) § 3.3.7 Redundant Entry Permalink Referenced in: § 1.2.7 Extended Audio Description (Prerecorded) § 6. Glossary Permalink Referenced in: § 2.3.1 Three Flashes or Below Threshold § 2.3.2 Three Flashes § 6. Glossary (2) Permalink Referenced in: § 2.4.13 Focus Appearance Permalink Referenced in: § 2.1.1 Keyboard § 2.1.3 Keyboard (No Exception) § 2.5.1 Pointer Gestures § 2.5.2 Pointer Cancellation § 2.5.4 Motion Actuation § 2.5.7 Dragging Movements § 6. Glossary Permalink Referenced in: § 2.3.1 Three Flashes or Below Threshold § 6. Glossary Permalink Referenced in: § 3.1.1 Language of Page § 3.1.2 Language of Parts § 6.
Glossary (2) (3) (4) Permalink Referenced in: § 3.1.3 Unusual Words Permalink Referenced in: § 1.4.3 Contrast (Minimum) § 1.4.4 Resize Text § 1.4.5 Images of Text § 1.4.6 Contrast (Enhanced) § 1.4.9 Images of Text (No Exception) § 2.5.3 Label in Name § 6. Glossary Permalink Referenced in: § 5.1 Interpreting Normative Requirements § 6. Glossary Permalink Referenced in: § 1.4.13 Content on Hover or Focus § 3.3.1 Error Identification § 3.3.3 Error Suggestion Permalink Referenced in: § 3.1.3 Unusual Words Permalink Referenced in: § 2.1.1 Keyboard § 2.1.2 No Keyboard Trap § 2.1.3 Keyboard (No Exception) § 6. Glossary Permalink Referenced in: § 2.1.4 Character Key Shortcuts Permalink Referenced in: § 2.4.6 Headings and Labels § 2.5.3 Label in Name § 3.3.2 Labels or Instructions § 6. Glossary Permalink Referenced in: § 1.4.3 Contrast (Minimum) § 1.4.6 Contrast (Enhanced) Permalink Referenced in: § 3.3.4 Error Prevention (Legal, Financial, Data) Permalink Referenced in: § 2.4.4 Link Purpose (In Context) Permalink Referenced in: § 1.2.4 Captions (Live) § 1.2.9 Audio-only (Live) § 6.
Glossary Permalink Referenced in: § 3.1.5 Reading Level Permalink Referenced in: § 1.4.2 Audio Control § 1.4.8 Visual Presentation § 1.4.13 Content on Hover or Focus § 2.1.4 Character Key Shortcuts § 2.4.1 Bypass Blocks § 2.4.9 Link Purpose (Link Only) § 2.5.2 Pointer Cancellation § 3.1.3 Unusual Words § 3.1.4 Abbreviations § 3.1.6 Pronunciation § 3.2.5 Change on Request § 3.2.6 Consistent Help § 3.3.8 Accessible Authentication (Minimum) § 3.3.9 Accessible Authentication (Enhanced) § 6. Glossary (2) Permalink Referenced in: § 1.2.1 Audio-only and Video-only (Prerecorded) § 1.2.2 Captions (Prerecorded) § 1.2.3 Audio Description or Media Alternative (Prerecorded) § 6. Glossary Permalink Referenced in: § 2.3.3 Animation from Interactions Permalink Referenced in: § 2.5.8 Target Size (Minimum) § 6. Glossary Permalink Referenced in: § 1.1.1 Non-text Content § 2.5.3 Label in Name § 4.1.2 Name, Role, Value § 6. Glossary Permalink Referenced in: § 2.4.3 Focus Order Permalink Referenced in: § 1.1.1 Non-text Content § 3.3.8 Accessible Authentication (Minimum) § 6.
Glossary Permalink Referenced in: § 5.1 Interpreting Normative Requirements § 6. Glossary Permalink Referenced in: § 1.4.8 Visual Presentation Permalink Referenced in: § 2.2.2 Pause, Stop, Hide Permalink Referenced in: § 2.4.13 Focus Appearance Permalink Referenced in: § 2.5.5 Target Size (Enhanced) § 2.5.8 Target Size (Minimum) Permalink Referenced in: § 1.2.1 Audio-only and Video-only (Prerecorded) § 1.2.2 Captions (Prerecorded) § 1.2.3 Audio Description or Media Alternative (Prerecorded) § 1.2.5 Audio Description (Prerecorded) § 1.2.6 Sign Language (Prerecorded) § 1.2.7 Extended Audio Description (Prerecorded) § 1.2.8 Media Alternative (Prerecorded) § 1.4.7 Low or No Background Audio Permalink Referenced in: § 1.3.1 Info and Relationships § 1.4.11 Non-text Contrast § 2.4.13 Focus Appearance § 2.5.8 Target Size (Minimum) § 6. Glossary Permalink Referenced in: § 6. Glossary Permalink Referenced in: § 2.4.5 Multiple Ways § 3.3.7 Redundant Entry § 3.3.8 Accessible Authentication (Minimum) § 3.3.9 Accessible Authentication (Enhanced) § 5.2.3 Complete processes § 6. Glossary (2) (3) Permalink Referenced in: § 1.3.1 Info and Relationships § 1.3.2 Meaningful Sequence § 1.3.5 Identify Input Purpose § 1.3.6 Identify Purpose § 3.1.1 Language of Page § 3.1.2 Language of Parts § 4.1.2 Name, Role, Value § 4.1.3 Status Messages § 6.
Glossary (2) (3) Permalink Referenced in: § 2.4.4 Link Purpose (In Context) Permalink Referenced in: § 4.1.2 Name, Role, Value Permalink Referenced in: § 1.1.1 Non-text Content § 1.4.3 Contrast (Minimum) § 1.4.6 Contrast (Enhanced) § 1.4.9 Images of Text (No Exception) Permalink Referenced in: § 2.2.3 No Timing Permalink Referenced in: § 1.3.6 Identify Purpose Permalink Referenced in: § 1.3.1 Info and Relationships § 6. Glossary Permalink Referenced in: § 6. Glossary (2) (3) (4) Permalink Referenced in: § 5. Conformance § 5.2.4 Only Accessibility-Supported Ways of Using Technologies § 5.2.5 Non-Interference § 5.3.1 Required Components of a Conformance Claim § 5.3.2 Optional Components of a Conformance Claim (2) § 6. Glossary (2) Permalink Referenced in: § 4.1.2 Name, Role, Value § 4.1.3 Status Messages Permalink Referenced in: § 3.2.4 Consistent Identification Permalink Referenced in: § 3.2.3 Consistent Navigation Permalink Referenced in: § 5.2.1 Conformance Level Permalink Referenced in: § 2.4.10 Section Headings Permalink Referenced in: § 2.4.5 Multiple Ways § 2.4.8 Location § 3.2.3 Consistent Navigation § 3.2.4 Consistent Identification § 3.2.6 Consistent Help Permalink Referenced in: § 6.
Glossary (2) Permalink Referenced in: § 1.2.6 Sign Language (Prerecorded) Permalink Referenced in: § 2.5.1 Pointer Gestures § 2.5.2 Pointer Cancellation § 2.5.7 Dragging Movements Permalink Referenced in: § 1.1.1 Non-text Content Permalink Referenced in: § 1.4.11 Non-text Contrast § 6. Glossary Permalink Referenced in: § 4.1.3 Status Messages Permalink Referenced in: § 1.3.1 Info and Relationships § 6. Glossary Permalink Referenced in: § 1.4.12 Text Spacing Permalink Referenced in: § 3.1.5 Reading Level § 6. Glossary Permalink Referenced in: § 1.2.2 Captions (Prerecorded) § 1.2.3 Audio Description or Media Alternative (Prerecorded) § 1.2.4 Captions (Live) § 1.2.5 Audio Description (Prerecorded) § 1.2.6 Sign Language (Prerecorded) § 1.2.7 Extended Audio Description (Prerecorded) § 1.2.8 Media Alternative (Prerecorded) § 2.2.3 No Timing Permalink Referenced in: § 2.5.5 Target Size (Enhanced) § 2.5.8 Target Size (Minimum) Permalink Referenced in: § 2.4.13 Focus Appearance § 5.2.4 Only Accessibility-Supported Ways of Using Technologies § 5.2.5 Non-Interference § 5.3.1 Required Components of a Conformance Claim § 6. Glossary (2) (3) Permalink Referenced in: § 1.1.1 Non-text Content § 1.4.3 Contrast (Minimum) § 1.4.4 Resize Text § 1.4.5 Images of Text § 1.4.6 Contrast (Enhanced) § 1.4.9 Images of Text (No Exception) § 1.4.12 Text Spacing § 2.5.3 Label in Name § 6.
Glossary (2) (3) Permalink Referenced in: § 1.1.1 Non-text Content § 6. Glossary (2) Permalink Referenced in: § 2.5.2 Pointer Cancellation § 6. Glossary Permalink Referenced in: § 3.1.3 Unusual Words Permalink Referenced in: § 2.4.13 Focus Appearance § 2.5.7 Dragging Movements § 2.5.8 Target Size (Minimum) § 4.1.2 Name, Role, Value § 6. Glossary (2) (3) (4) (5) (6) (7) (8) (9) Permalink Referenced in: § 3.3.4 Error Prevention (Legal, Financial, Data) Permalink Referenced in: § 1.3.6 Identify Purpose § 1.4.3 Contrast (Minimum) § 1.4.6 Contrast (Enhanced) § 1.4.11 Non-text Contrast § 2.1.4 Character Key Shortcuts § 2.4.10 Section Headings § 2.4.11 Focus Not Obscured (Minimum) § 2.4.12 Focus Not Obscured (Enhanced) § 2.5.3 Label in Name § 2.5.4 Motion Actuation § 3.2.1 On Focus § 3.2.2 On Input § 4.1.2 Name, Role, Value § 6. Glossary § 7.