Page 47 - GiGW3

5. Guidelines
Accessibility
T he Success criteria under this section have been adopted
from W3C Web content accessibility guidelines
(https://www.w3.org/TR/WCAG21/). Developers are advised
to refer to the W3C website for the complete description
and techniques to meet the success criteria.
Statement: All non-text content that is presented to the user has a
text alternative that serves the equivalent purpose, except
for the situations listed below:
(a) Controls, Input: If non-text content is a control or accepts user input, then it has a name
that describes its purpose (Refer to Success Criterion 4.1.2 for additional requirements for
controls and content that accepts user input);
(b) Time-Based Media: If non-text content is time-based media, then text alternatives at
least provide descriptive identification of the non-text content (Refer to Guideline 1.2 for
additional requirements for media);
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(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 a
experience, then text alternatives at least provide descriptive identification of the non-text technology (by using blank alt attribute). content in synchronis
content; Reference: WCAG 2.1 - 1.1.1
(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
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.
describe the purpose of the non-text content are provided and alternative forms of Benefit: This enables
CAPTCHA using output modes for different types of sensory perception are provided to Statement: For pre-recorded audio-only and pre-recorded presentations.
accommodate different disabilities; and video-only media, the following are true, except when the audio Government organisati
(f) Decoration, Formatting, Invisible: If non-text content is pure decoration, is used only for the part of the conte
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 i
ignored by assistive technology. labelled as such: meaningful sound effe
Benefit: Conformity makes information conveyed by non-text content accessible through the use Developer action: Ens
of a text alternative. For example, a person who cannot see a picture can have the text alternative Reference: WCAG 2.1 -
(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
presents equivalent information for pre-recorded audio-only content; and
alternative displayed so that he or she can read it.
5.2 Government organisation action: A meaningful explanatory text equivalent must be specified for (b) Pre-recorded Video-only: Either an alternative for time-based media or an audio track Statement: An alterna
images and other non-text content. The description should summarise the content or purpose of is provided that presents equivalent information for pre-recorded video-only content. description of the pr
purpose. Benefit: The intent of this Success Criterion is to make information conveyed by pre-recorded for synchronised medi
the image. For example, to use the description ‘Picture’ to explain a graphic does not serve any
audio-only and pre-recorded video-only content available to all users. Alternatives for time-based
media alternative for
Developer action: For images text equivalent can be provided by using the ALT attribute. The ALT
media that are text based make information accessible because text can be rendered through any
text for an image is displayed before the image is fully downloaded. It is the main source of image
information for users of text-only browsers, users of browsers with graphics turned off and users sensory modality (for example, visual, auditory or tactile) to match the needs of the user. Benefit: provides peop
Government organisation action: Create the alternate for time-based media, i.e, transcript in
who are sight impaired. The following situations are exceptions: synchronised media pr
(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
needed when the synchronised media is, itself, an alternate presentation of information that is also Government organisati
have a name describing the purpose of the control; of the video content.
presented via text on the Web page
(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 neede
provides a descriptive identification of the same; in the synchronised m
(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
5.2.1 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.
(d) If non-text content is primarily intended to create a specific sensory experience, Developer action: Dev
then text alternatives at least provide descriptive identification of the non-text content; media or audio descri
(e) CAPTCHA: If the purpose of non-text content is to confirm that content is being Reference: WCAG 2.1 -
accessed by a person rather than a computer, then text alternatives that identify and Evaluator action: The
describe the purpose of the non-text content are provided and alternative forms of
CAPTCHA using output modes for different types of sensory perception are provided to
accommodate different disabilities; and
(f) If non-text content is pure decoration, is used only for visual formatting, or is not