Page 50 - GiGW3
P. 50

5. Guidelines








 (d) Sensory:  If  non-text  content  is  primarily  intended  to  create  a  specific  sensory   presented to users, then it is implemented in a way that it can be ignored by assistive   Statement: Captions are provided for all pre-recorded audio   Statement: Captions are provided for all live audio content     Government organisation action: None.                                                                                                                 Statement: Instructions p

 experience, then text alternatives at least provide descriptive identification of the non-text   technology (by using blank alt attribute).   content in synchronised media, except when the media is a   in synchronised media.                                                                                         Developer action: Developers must ensure that information and relationships that are implied by                                                       content do not rely solel
 content;  Reference: WCAG 2.1 - 1.1.1                                                                 5.2.3                                                                                                                                                                                                             visual or auditory formatting are preserved when the presentation format changes. For example,
 (e) CAPTCHA:  If  the  purpose  of  non-text  content  is  to  confirm  that  content  is  being   Evaluator action: The evaluator will test it manually and by using the accessibility extension to   media alternative for text and is clearly labelled as such                                                        when the content is read by a screen reader or when a user style sheet is substituted for the style                                                   components such as shape,
                                                                                                                                                                   Benefits: Enables people who are deaf or hard of hearing to watch real-time presentations.
 accessed by a person rather than a computer, then text alternatives that identify and   browser/ accessibility plug-in/web accessibility tool to check the conformity of this checkpoint.  Government organisation action: The government organisation must provide captions for live                                   sheet provided by the author. For example, a form contains several required fields. The labels for                                                     orientation, or sound.
 describe the purpose of the non-text content are provided and alternative forms of   Benefit: This enables people who are deaf or hard of hearing to watch synchronised media   audio content.                                                                                                                           the required fields are displayed in red. In addition, at the end of each label is an asterisk character
 CAPTCHA using output modes for different types of sensory perception are provided to   Statement: For pre-recorded audio-only and pre-recorded   presentations.   Developer action: Provide provision to publish captions                                                                                               (*). The instructions for completing the form indicate that "all required fields are displayed in red                                                  Benefit: Many users includ
 accommodate different disabilities; and  video-only media, the following are true, except when the audio   Government organisation action: The government organisations must create captions to provide   Reference: WCAG 2.1 - 1.2.4                                                                                   and marked with an asterisk *", followed by an example.                                                                                               about location or orienta
 (f) Decoration, Formatting, Invisible: If non-text content is pure decoration, is used only for   the part of the content available via the audio track. Captions not only include dialogue but identify                                                                                                                Reference: WCAG 2.1 - 1.3.1                                                                                                                           position of objects becom

 visual formatting, or is not presented to users, then it is implemented in a way that it can be   or video is a media alternative for text and is clearly   who is speaking and include non-speech information conveyed through sound, including   Evaluator action: The evaluator will test it manually to check the conformity of this checkpoint.   Evaluator action: The evaluator will test it manually and by using the accessibility extension to                      Government organisation a
 ignored by assistive technology.  labelled as such:  meaningful sound effects.                                                                                                                                                                                                                                          browser/accessibility plug-in/web accessibility tool/assistive technology to check the conformity                                                     Developer action:   Provi
 Benefit: Conformity makes information conveyed by non-text content accessible through the use   Developer action: Ensure that the captions are available with audio content.  Statement: Audio description is provided for all                                                                                           of this checkpoint.                                                                                                                                   characteristics of compon
                   https://www.w3.org/WAI/WCAG21/Understanding/captions-prerecorded.html#dfn-synchronized-media

 of a text alternative. For example, a person who cannot see a picture can have the text alternative   Reference: WCAG 2.1 - 1.2.2                                 pre-recorded video content in synchronised media.                                                                                                                                                                                                                                                           done by providing textual
 (a) Pre-recorded Audio-only: An alternative for time-based media is provided that
 read aloud using synthesised speech. A person who cannot hear an audio file can have the text   Evaluator action: The evaluator will test the it manually to check the conformity of this checkpoint.                                                                                                                    Statement: When the sequence in which content is presented                                                                                            be understood; for exampl
 presents equivalent information for pre-recorded audio-only content; and
 alternative displayed so that he or she can read it.                                                                                                                                                                                                                                                                                                                                                                                                                          the next step. The button
 (b) Pre-recorded Video-only: Either an alternative for time-based media or an audio track                                                                         Benefits: Provides people who are blind or visually impaired access to the visual information in a                                                     affects its meaning, a correct reading sequence can be
 Government organisation action: A meaningful explanatory text equivalent must be specified for   Statement: An alternative for time-based media or audio                                                                                                                                                                                                                                                                                                                       press the round button la
 is provided that presents equivalent information for pre-recorded video-only content.                                                                             synchronised media presentation. During existing pauses in dialogue, audio description provides
 images and other non-text content. The description should summarise the content or purpose of   description of the pre-recorded video content is provided         information about actions, characters, scene changes and on-screen text that are important and                                                        programmatically determined.                                                                                                                          button.

 the image. For example, to use the description ‘Picture’ to explain a graphic does not serve any                                                                                                                                                                                                                                                                                                                                                                              Reference: WCAG 2.1 - 1.3
 he Success criteria under this section have been adopted   purpose.   Benefit: The intent of this Success Criterion is to make information conveyed by pre-recorded   for synchronised media, except when the media is a   are not described or spoken in the main soundtrack.                                           Benefits: This helps people who rely on assistive technologies like screen readers because the                                                         Evaluator action: The eva

 from W3C Web content accessibility guidelines   Developer action: For images text equivalent can be provided by using the ALT attribute. The ALT   audio-only and pre-recorded video-only content available to all users. Alternatives for time-based   media alternative for text and is clearly labelled as such.  5.2.4  Government organisation action: Provide Audio description of pre-recorded video content  meaning evident in the sequencing of the information in the visual presentation wi
                                                                                                                                                                   Developer action: Provide provision to publish audio description
 media that are text based make information accessible because text can be rendered through any
 (https://www.w3.org/TR/WCAG21/). Developers are advised   text for an image is displayed before the image is fully downloaded. It is the main source of image   sensory modality (for example, visual, auditory or tactile) to match the needs of the user.   Reference: WCAG 2.1 - 1.2.5                               when the content is presented in spoken form. This also preserves the meaning of the page when
 information for users of text-only browsers, users of browsers with graphics turned off and users   Benefit: provides people who are blind or visually impaired access to the visual information in a                                                                                                                    the CSS is turned off or not supported.                                                                                                               Statement: Content does n
 to refer to the W3C website for the complete description   Government organisation action:  Create  the  alternate  for  time-based  media,  i.e,  transcript  in   Evaluator action: The evaluator will test it manually a check the conformity of this checkpoint.
 who are sight impaired. The following situations are exceptions:  synchronised media presentation                                                                                                                                                                                                                       Government organisation action: None.
 and techniques to meet the success criteria.  (a)   If the non-text content is a control or accepts input e.g., a submit button then it must   case audio only and transcript or audio track in case of video only content. Captions are not                                                                                                                                                                                                                                  single display orientatio
 needed when the synchronised media is, itself, an alternate presentation of information that is also   Government organisation action: The government organisations must provide audio description   Statement: Information, structure and relationships                                                                Developer action: Provide a meaningful reading sequence.
 have a name describing the purpose of the control;   of the video content. The audio description augments the audio portion of the presentation with                                                                                                                                                                    Note: Developers must keep in mind that a sequence is meaningful if change of order shall impact                                                      unless a specific display
 presented via text on the Web page                                                                                                                                conveyed through presentation can be programmatically
 Statement: All non-text content that is presented to the user has a   (b)   If the non-text content is time-based media (audio/video) then the text equivalent   Developer action: Make provision to provide alternatives for time-based media.   the information needed when the video portion is not available. Alternatively, all of the information   its meaning. Two independent content items like two separate articles in a page may be placed in
 provides a descriptive identification of the same;   in the synchronised media (both visual and auditory) may be provided in text form. If all of the              determined or are available in text.                                                                                                                  any sequence without affecting the meaning. Similarly, the navigation block and the content area                                                      Benefit:  This Success Cri
 text alternative that serves the equivalent purpose, except   (c)   If non-text content is a test or exercise that would be invalid if presented in text, then   Reference: WCAG 2.1 - 1.2.1  information  in the  video track  is  already provided  in  the  audio  track, no  audio  description  is                 may be placed in any sequence without affecting their meaning. HTML text is always a meaningful                                                       and  not  restrict  the

 for the situations listed below:  text alternatives at least provide descriptive identification of the non-text content;      Evaluator action: The evaluator will test it manually to check the conformity of this checkpoint.   necessary.  Benefits: Sighted users perceive structure and relationships through various visual cues present   sequence. Tables and ordered lists are meaningful sequences, but unordered lists are not.  It must                             orientation and promotes

 (d)   If non-text content is primarily intended to create a specific sensory experience,   Developer action: Developer must provide provision for publishing the alternative for time-based   on a page (page headings are in a larger and bold font; list items are preceded by a bullet; form                          be clear that providing a particular linear order is only required where it affects meaning There may                                                 Users with dexterity impa

 (a) Controls, Input: If non-text content is a control or accepts user input, then it has a name   then text alternatives at least provide descriptive identification of the non-text content;  media or audio description of the pre-recorded video content  fields may be positioned as groups that share text labels; a different background colour may be   be more than one order that is "correct" and only one correct order needs to be provided.                        their fixed orientation.
                   https://www.w3.org/WAI/WCAG21/Understanding/audio-description-or-media-alternative-prerecorded.html
 that describes its purpose (Refer to Success Criterion 4.1.2 for additional requirements for   (e)   CAPTCHA: If the purpose of non-text content is to confirm that content is being   Reference: WCAG 2.1 - 1.2.3  used to indicate related items and so on). However, visually challenged users cannot take            Reference: WCAG 2.1 - 1.3.2                                                                                                                           Users with low vision wil
 controls and content that accepts user input);  accessed by a person rather than a computer, then text alternatives that identify and   Evaluator action: The evaluator will test the it manually to check the conformity of this checkpoint.   advantage of these cues. It must be ensured that these information and relationships are   Evaluator action: The evaluator will test it manually and by using the accessibility extension to                                  example to increase the t
 (b) Time-Based Media: If non-text content is time-based media, then text alternatives at   describe the purpose of the non-text content are provided and alternative forms of   preserved even when the presentation format changes. (For example, when the content is read by                                          browser/accessibility plug-in/web accessibility tool/assistive technology to check the conformity

 least  provide  descriptive  identification  of  the  non-text  content  (Refer  to  Guideline  1.2  for   CAPTCHA using output modes for different types of sensory perception are provided to   a screen reader or CSS is turned off or replaced).                                                                     of this checkpoint.
 additional requirements for media);  accommodate different disabilities; and
 (f)   If non-text content is pure decoration, is used only for visual formatting, or is not


                                                             50
   45   46   47   48   49   50   51   52   53   54   55