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10. Non-web documents

There is currently no content classified with this term.

Requirements in clause 10 apply to documents:

Clause 9 provides requirements for documents that are in web pages or that are embedded in web pages and that are used in the rendering or that are intended to be rendered together with the web page in which they are embedded.

    • that are not web pages;
    • that are not embedded in web pages;
    • that are embedded in web pages and that are not used in the rendering and that are not intended to be rendered together with the web page in which they are embedded.

Note: The success criteria set out in this clause are intended to harmonize with the Working Group Note [i.26] produced by the W3C's WCAG2 ICT Task Force 

10.2.1: Non-text content

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.1.

Table 10.1: Document success criterion: Non-text content

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:

  • Controls, Input: If non-text content is a control or accepts user input, then it has a name that describes its purpose. (Refer to WCAG 2.0 Guideline 4.1 [4] for additional requirements for controls and content that accepts user input.)
  • 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 WCAG 2.0 Guideline 1.2 [4] for additional requirements for media.)
  • Test: If non-text content is a test or exercise that would be invalid if presented in text, then text alternatives at least provide descriptive identification of the non-text content.
  • Sensory: If non-text content is primarily intended to create a specific sensory experience, then text alternatives at least provide descriptive identification of the non-text content.
  • CAPTCHA: If the purpose of non-text content is to confirm that content is being accessed by a person rather than a computer, then text alternatives that identify and 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.
  • Decoration, Formatting, Invisible: If non-text content is pure decoration, is used only for visual formatting, or is not presented to users, then it is implemented in a way that it can be ignored by assistive technology.

NOTE 1: CAPTCHAs do not currently appear outside of the Web. However, if they do appear, this guidance is accurate.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 1.1.1 Non-text content with the words

10.2.2: Audio-only and video-only (pre-recorded)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.2.

Table 10.2: Document success criterion: Audio-only and video-only (pre-recorded)

For pre-recorded audio-only and pre-recorded video-only media, the following are true, except when the audio or video is a media alternative for text and is clearly labelled as such:

  • Pre-recorded Audio-only: An alternative for time-based media is provided that presents equivalent information for pre-recorded audio-only content.
  • Pre-recorded Video-only: Either an alternative for time-based media or an audio track is provided that presents equivalent information for pre-recorded video-only content.

NOTE 1: The alternative can be provided directly in the document - or provided in an alternate version that meets the success criterion.

NOTE 2: This success criterion is identical to the WCAG 2.0

10.2.3: Captions (pre-recorded)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.3.

Table 10.3: Document success criterion: Captions (pre-recorded)

For pre-recorded audio-only and pre-recorded video-only media, the following are true, except when the audio or video is a media alternative for text and is clearly labelled as such:

  • Pre-recorded Audio-only: An alternative for time-based media is provided that presents equivalent information for pre-recorded audio-only content.
  • Pre-recorded Video-only: Either an alternative for time-based media or an audio track is provided that presents equivalent information for pre-recorded video-only content.

NOTE 1: The alternative can be provided directly in the document - or provided in an alternate version that meets the success criterion.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 1.2.1 Audio-only and Video-only (Pre-recorded) with the addition of note 1 above.

10.2.4: Audio description or media alternative (pre-recorded)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.4.

Table 10.4: Document success criterion: Audio description or media alternative (pre-recorded)

An alternative for time-based media or audio description of the pre-recorded video content is provided for synchronized media, except when the media is a media alternative for text and is clearly labeled as such.

NOTE 1: The WCAG 2.0 definition of "audio description" says that "audio description" is "Also called 'video description' and 'descriptive narration'".

NOTE 2: Secondary or alternate audio tracks are commonly used for this purpose.

NOTE 3: This success criterion is identical to the WCAG 2.0 Success Criterion 1.2.3 Audio Description or Media Alternative (Pre-recorded) with the addition of notes 1 and 2 above.

10.2.5: Captions (live)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.5.

Table 10.5: Document success criterion: Captions (live)

Captions are provided for all live audio content in synchronized media.

NOTE 1: The WCAG 2.0 definition of "captions" notes that "in some countries, captions are called subtitles". They are also sometimes referred to as "subtitles for the hearing impaired". Per the definition in WCAG 2.0, to meet this success criterion, whether called captions or subtitles, they would have to provide "synchronized visual and / or text alternative for both speech and non-speech audio information needed to understand the media content" where non-speech information includes "sound effects, music, laughter, speaker identification and location".

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 1.2.4 Captions (Live) with the addition of note 1 above.

10.2.6: Audio description (pre-recorded)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.6.

Table 10.6: Document success criterion: Audio description (pre-recorded)

Audio description is provided for all pre-recorded video content in synchronized media.

NOTE 1: The WCAG 2.0 definition of "audio description" says that audio description is "Also called 'video description' and 'descriptive narration'".

NOTE 2: Secondary or alternate audio tracks are commonly used for this purpose.

NOTE 3: This success criterion is identical to the WCAG 2.0 Success Criterion 1.2.5 Audio Description (Pre-recorded) (Level AA) with the addition of note 1 above.

10.2.7: Info and relationships

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.7.

Table 10.7: Document success criterion: Info and relationships

Information, structure, and relationships conveyed through presentation can be programmatically determined or are available in text.

NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 1.3.1 Info and Relationships.

10.2.8: Meaningful sequence

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.8.

Table 10.8: Document success criterion: Meaningful sequence

When the sequence in which content is presented affects its meaning, a correct reading sequence can be programmatically determined.

NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 1.3.2 Meaningful Sequence.

10.2.9: Sensory characteristics

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.9.

Table 10.9: Document success criterion: Sensory characteristics

Instructions provided for understanding and operating content do not rely solely on sensory characteristics of components such as shape, size, visual location, orientation, or sound.

NOTE 1: For requirements related to colour, refer to WCAG 2.0 Guideline 1.4 [4].

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 1.3.3 Sensory Characteristics with the words "WCAG 2.0" added before the word "Guideline" in note 1 above.

10.2.10: Use of colour

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.10.

Table 10.10: Document success criterion: Use of colour

Colour is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.

NOTE 1: This success criterion addresses colour perception specifically. Other forms of perception are covered in WCAG 2.0 Guideline 1.3 [4] including programmatic access to colour and other visual presentation coding.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 1.4.1 Use of Color with the words "WCAG 2.0" added before the word "Guideline" in note 1 above.

10.2.11: Audio control

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.11.

Table 10.11: Document success criterion: Audio control

If any audio in a document 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.

NOTE 1: Since any part of a document that does not meet this success criterion can interfere with a user's ability to use the whole document, all content in the document (whether or not it is used to meet other success criteria) shall meet this success criterion.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 1.4.2 Audio Control replacing "on a Web page" with "in a document", "any content" with "any part of a document", "whole page" with "whole document", "on the Web page" with "in the document", removing "See Conformance Requirement 5: Non-Interference" and adding note 1.

10.2.12: Contrast (minimum)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.12.

Table 10.12: Document success criterion: Contrast (minimum)

The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following:

  • Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1.
  • Incidental: Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.
  • Logotypes: Text that is part of a logo or brand name has no minimum contrast requirement.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 1.4.3 Contrast (Minimum).

10.2.13: Resize text

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.13.

Table 10.13: Document success criterion: Resize text

Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality.

NOTE 1: Content for which there are software players, viewers or editors with a 200 percent zoom feature would automatically meet this success criterion when used with such players, unless the content will not work with zoom.

NOTE 2: This success criterion is about the ability to allow users to enlarge the text on screen at least up to 200 % without needing to use assistive technologies. This means that the application provides some means for enlarging the text 200 % (zoom or otherwise) without loss of content or functionality or that the application works with the platform features that meet this requirement.

NOTE 3: This success criterion is identical to the WCAG 2.0 Success Criterion 1.4.4 Resize text with the addition of notes 1 and 2 above.

10.2.14: Images of text

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.14.

Table 10.14: Document success criterion: Images of text

If the technologies being used can achieve the visual presentation, text is used to convey information rather than images of text except for the following:

  • Customizable: The image of text can be visually customized to the user's requirements.
  • Essential: A particular presentation of text is essential to the information being conveyed.

NOTE 1: Logotypes (text that is part of a logo or brand name) are considered essential.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 1.4.5 Images of Text.

10.2.15: Keyboard

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.15.

Table 10.15: Document success criterion: Keyboard

All functionality of the content is operable through a keyboard interface without requiring specific timings for individual keystrokes, except where the underlying function requires input that depends on the path of the user's movement and not just the endpoints.

NOTE 1: This exception relates to the underlying function, not the input technique. For example, if using handwriting to enter text, the input technique (handwriting) requires path-dependent input but the underlying function (text input) does not.

NOTE 2: This does not forbid and should not discourage providing mouse input or other input methods in addition to keyboard operation.

NOTE 3: This success criterion is identical to the WCAG 2.0 Success Criterion 2.1.1 Keyboard.

10.2.16: No keyboard trap

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.16.

Table 10.16: Document success criterion: No keyboard trap

If keyboard focus can be moved to a component of the document 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.

NOTE 1: Since any part of a document that does not meet this success criterion can interfere with a user's ability to use the whole document, all content in the document (whether or not it is used to meet other success criteria) must meet this success criterion.

NOTE 2: Standard exit methods may vary by platform. For example, on many desktop platforms, the Escape key is a standard method for exiting.

NOTE 3: This success criterion is identical to the WCAG 2.0 Success Criterion 2.1.2 No Keyboard Trap replacing "page" and "Web page" with "document", removing "See Conformance Requirement 5: Non-Interference" and with the addition of note 1 above.

10.2.17: Timing adjustable

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.17.

Table 10.17: Document success criterion: Timing adjustable

For each time limit that is set by the document, at least one of the following is true:

  • Turn off: The user is allowed to turn off the time limit before encountering it; or
  • Adjust: The user is allowed to adjust the time limit before encountering it over a wide range that is at least ten times the length of the default setting; or
  • Extend: The user is warned before time expires and given at least 20 seconds to extend the time limit with a simple action (for example, "press the space bar"), and the user is allowed to extend the time limit at least ten times; or
  • Real-time Exception: The time limit is a required part of a real-time event (for example, an auction), and no alternative to the time limit is possible; or
  • Essential Exception: The time limit is essential and extending it would invalidate the activity; or
  • 20 Hour Exception: The time limit is longer than 20 hours.

NOTE 1: This success criterion helps ensure that users can complete tasks without unexpected changes in content or context that are a result of a time limit. This success criterion should be considered in conjunction with WCAG 2.0 Success Criterion 3.2.1, which puts limits on changes of content or context as a result of user action.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 2.2.1 Timing Adjustable replacing "the content" with "documents" and with the words "WCAG 2.0" added before the word "Success Criterion" in note 1 above.

10.2.18: Pause, stop, hide

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.18.

Table 10.18: Document success criterion: Pause, stop, hide

For moving, blinking, scrolling, or auto-updating information, all of the following are true:

  • Moving, blinking, scrolling: For any moving, blinking or scrolling information that (1) starts automatically, (2) lasts more than five seconds, and (3) is presented in parallel with other content, there is a mechanism for the user to pause, stop, or hide it unless the movement, blinking, or scrolling is part of an activity where it is essential; and
  • Auto-updating: For any auto-updating information that (1) starts automatically and (2) is presented in parallel with other content, there is a mechanism for the user to pause, stop, or hide it or to control the frequency of the update unless the auto-updating is part of an activity where it is essential.

NOTE 1: For requirements related to flickering or flashing content, refer to WCAG 2.0 Guideline 2.3.

NOTE 2: This success criteria is applicable to all content in the document (whether or not there is an alternate accessible version of the document) since any part of a document that does not meet this success criterion can interfere with a user's ability to use the whole document (including a link to the alternate version).

NOTE 3: Content that is updated periodically by software or that is streamed to the user agent is not required to preserve or present information that is generated or received between the initiation of the pause and resuming presentation, as this may not be technically possible, and in many situations could be misleading to do so.

NOTE 4: An animation that occurs as part of a preload phase or similar situation can be considered essential if interaction cannot occur during that phase for all users and if not indicating progress could confuse users or cause them to think that content was frozen or broken.

NOTE 5: This is to be applied to all content. Any content, whether informative or decorative, that is updated automatically, blinks, or moves may create an accessibility barrier.

NOTE 6: This success criterion is identical to the WCAG 2.0 Success Criterion 2.2.2 Pause, Stop, Hide replacing "page" and "Web page" with "document", removing "See Conformance Requirement 5: Non-Interference" in note 2 of the success criterion, with the words "WCAG 2.0" added before the word "Guideline" in note 1 above and with note 2 above re-drafted to avoid the use of the word "must".

10.2.19: Three flashes or below threshold

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.19.

Table 10.19: Document success criterion: Three flashes or below threshold

Documents do not contain anything that flashes more than three times in any one second period, or the flash is below the general flash and red flash thresholds.

NOTE 1: This success criterion is applicable to all content in the document (whether or not there is an alternate accessible version of the document) since any part of a document that does not meet this success criterion can interfere with a user's ability to use the whole document (including a link to the alternate version).

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 2.3.1 Three Flashes or Below Threshold replacing "Web pages" with "documents", "the whole page" with "the whole document", "the Web page" with "the document" and removing "See Conformance Requirement 5: Non-Interference" and with note 2 above re-drafted to avoid the use of the word "must".

10.2.21: Document titled

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.21.

Table 10.21: Document success criterion: Document titled

Documents have titles that describe topic or purpose.

NOTE 1: The name of a document (e.g. document, media file) is a sufficient title if it describes the topic or purpose.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 2.4.2 Page Titled replacing "Web pages" with "documents", "Page" with "Document" and with the addition of note 1 above.

10.2.22: Focus order

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.22.

Table 10.22: Document success criterion: Focus order

If a document can be navigated sequentially and the navigation sequences affect meaning or operation, focusable components receive focus in an order that preserves meaning and operability.

NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 2.4.3 Focus Order replacing "Web page" with "document".

10.2.23: Link purpose (in context)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.23.

Table 10.23: Document success criterion: Link purpose (in context)

The purpose of each link can be determined from the link text alone or from the link text together with its programmatically determined link context, except where the purpose of the link would be ambiguous to users in general.

NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 2.4.4 Link Purpose (In Context).

10.2.25: Headings and labels

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.25.

Table 10.25: Document success criterion: Headings and labels
Headings and labels describe topic or purpose.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 2.4.6 Headings and Labels.

10.2.26: Focus visible

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.26.

Table 10.26: Document success criterion: Focus visible
Any keyboard operable user interface has a mode of operation where the keyboard focus indicator is visible.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 2.4.7 Focus Visible.

10.2.27: Language of page

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.27.

Table 10.27: Document success criterion: Language of page
The default human language of each document can be programmatically determined.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 3.1.1 Language of Page replacing "web page" with "document".

10.2.28: Language of parts

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.28.

10.2.29: On focus

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.29.

Table 10.29: Document success criterion: On focus
When any component receives focus, it does not initiate a change of context.

NOTE 1: Some compound documents and their user agents are designed to provide significantly different viewing and editing functionality depending upon what portion of the compound document is being interacted with (e.g. a presentation that contains an embedded spreadsheet, where the menus and toolbars of the user agent change depending upon whether the user is interacting with the presentation content, or the embedded spreadsheet content). If the user uses a mechanism other than putting focus on that portion of the compound document with which they mean to interact (e.g. by a menu choice or special keyboard gesture), any resulting change of context would not be subject to this success criterion because it was not caused by a change of focus.

NOTE 2: This success criterion is identical to the WCAG 2.0 Success Criterion 3.2.1 On Focus with the addition of note 1.

10.2.30: On input

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.30.

Table 10.30: Document success criterion: On input
Changing the setting of any user interface component does not automatically cause a change of context unless the user has been advised of the behaviour before using the component.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 3.2.2 On Input.

10.2.33: Error identification

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.33.

Table 10.33: Document success criterion: Error identification
If an input error is automatically detected, the item that is in error is identified and the error is described to the user in text.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 3.3.1 Error Identification.

10.2.34: Labels or instructions

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.34.

Table 10.34: Document success criterion: Labels or instructions
Labels or instructions are provided when content requires user input.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 3.3.2 Labels or Instructions.

10.2.35: Error suggestion

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.35.

Table 10.35: Document success criterion: Error suggestion
If an input error is automatically detected and suggestions for correction are known, then the suggestions are provided to the user, unless it would jeopardize the security or purpose of the content.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 3.3.3 Error Suggestion.

10.2.36: Error prevention (legal, financial, data)

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.36.

Table 10.36: Document success criterion: Error prevention (legal, financial, data)

For documents that cause legal commitments or financial transactions for the user to occur, that modify or delete user-controllable data in data storage systems, or that submit user test responses, at least one of the following is true:

  1. Reversible: Submissions are reversible.
  2. Checked: Data entered by the user is checked for input errors and the user is provided an opportunity to correct them.
  3. Confirmed: A mechanism is available for reviewing, confirming, and correcting information before finalizing the submission.
NOTE: This success criterion is identical to the WCAG 2.0 Success Criterion 3.3.4 Error Prevention (Legal, Financial, Data) replacing "web pages" with "documents".

10.2.37: Parsing

<p>Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.37.</p>

<table class="table">
<caption>Table 10.37: Document success criterion: Parsing</caption>
    <tbody>
        <tr>
            <td>For documents that use markup languages, in such a way that the markup is separately exposed and available to assistive technologies and accessibility features of software or to a user-selectable user agent, elements have complete start and end tags, elements are nested according to their specifications, elements do not contain duplicate attributes, and any IDs are unique, except where the specifications allow these features.</td>
        </tr>
        <tr>
            <td>
            <p>NOTE 1: Start and end tags that are missing a critical character in their formation, such as a closing angle bracket or a mismatched attribute value quotation mark are not complete.</p>

            <p>NOTE 2: Markup is not always available to assistive technology or to user selectable user agents such as browsers. In such cases, conformance to this provision would have no impact on accessibility as it can for web content where it is exposed.</p>

            <p>NOTE 3: Examples of markup that is separately exposed and available to assistive technologies and to user agents include but are not limited to: documents encoded in HTML, ODF, and OOXML. In these examples, the markup can be parsed entirely in two ways: (a) by assistive technologies which may directly open the document, (b) by assistive technologies using DOM APIs of user agents for these document formats.</p>

            <p>NOTE 4: This success criterion is identical to the WCAG 2.0 Success Criterion 4.1.1 Parsing replacing "In content implemented using markup languages" with "For documents that use markup languages, in such a way that the markup is separately exposed and available to assistive technologies and accessibility features of software or to a user-selectable user agent" with the addition of notes 2 and 3 above.</p>
            </td>
        </tr>
    </tbody>
</table>
 

10.2.38: Name, role, value

Where ICT is a non-web document, it shall satisfy the success criterion in Table 10.38.

Table 10.38: Document success criterion: Name, role, value
For all user interface components (including but not limited to: form elements, links and components generated by scripts), the name and role can be programmatically determined; states, properties, and values that can be set by the user can be programmatically set; and notification of changes to these items is available to user agents, including assistive technologies.

NOTE 1: This success criterion is primarily for software developers who develop or use custom user interface components. Standard user interface components on most accessibility-supported platforms already meet this success criterion when used according to specification.

NOTE 2: For document formats that support interoperability with assistive technology, standard user interface components often meet this success criterion when used according to the general design and accessibility guidance for the document format.

NOTE 3: This success criterion is identical to the WCAG 2.0 Success Criterion 4.1.2 Name, Role, Value replacing the original WCAG 2.0 note with: "This success criterion is primarily for software developers who develop or use custom user interface components. For example, standard user interface components on most accessibility-supported platforms already meet this success criterion when used according to specification." and with the addition of note 2 above.

10.2.39: Caption positioning

<p>Where ICT is a non-web document that contains synchronized media with captions, the captions should not obscure relevant information in the synchronized media.</p>
 

10.2.40: Audio description timing

Where ICT is a non-web document that contains synchronized media with audio description, the audio description should not interfere with relevant audio information in the synchronized media.

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