The purpose of this guideline is to provide access to time-based and synchronized - media. This includes media that is: +
+ The purpose of this guideline is to provide access to time-based and synchronized media. + This includes media that is:
-To make it easy for authors to quickly determine which success criteria apply to their - content, the type of media each success criterion applies to is included in its short - name. +
+ Media can be live or prerecorded. + The success criteria names tell you if a success criterion applies to live or prerecorded media.
- -For - audio-only or - video-only media, you only need to apply the success criteria that say "audio-only" or "video-only" in their short name. If your media is not - audio-only or - video-only, then all the rest of the success criteria apply. +
+ To make it easy for authors to quickly determine which success criteria apply to their content, + the type of media each success criterion applies to is included in the name of the criterion.
- -Media can also be - live or - prerecorded. Each of the success criterion short names clearly tells you if the success criterion - applies to - live or - prerecorded media. +
For audio-only or video-only media, + you only need to apply the success criteria that include "audio-only" or "video-only" in their name, + except that at Level AAA, 1.2.8 Media Alternative (Prerecorded) also applies to video-only media. + If your media is not audio-only or video-only, then all of the other of the success criteria apply.
-
- Synchronized media is defined in the glossary as:
-
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.- -
Note that an audio file accompanied by interaction is covered here, as is a video-only +
+ Note that an audio file accompanied by interaction is covered here, as is a video-only file that involves interaction. These are covered because interaction must take place at a particular time. Having a text transcript that said, "for more information, click now," would not be very helpful since the reader would have no idea when the audio said, "now." As a result, synchronized captions would be needed.
- -Sometimes, there is so much dialogue that audio description cannot fit into existing +
+ Sometimes, there is so much dialogue that audio description cannot fit into existing pauses in the dialogue. The option at Level A to provide an alternative for time-based media instead of audio description for synchronized media would allow access to all of the information in the synchronized media. This option also allows access to the visual information in non-visual form when audio description is not provided for some other reason.
- -For synchronized media that includes interaction, interactive elements (for example - links) could be embedded in the alternative for time-based media. +
+ For synchronized media that includes interaction, interactive elements (for example, links) + could be embedded in the alternative for time-based media.
- -This guideline also includes (at Level AAA) sign language interpretation for synchronized +
+ This guideline also includes (at Level AAA) sign language interpretation for synchronized media as well as an approach called extended audio description. In extended audio description, the video is frozen periodically to allow more audio description to take place than is possible in the existing pauses in the dialogue. This is a case where higher-level Success Criteria build upon the requirements of lower-level Success Criterion with the intention of having cumulative, progressively stronger, requirements. - -
-Text alternatives and equivalents should match the human language of the original content (normally the default human language of the page). The 5.2 Conformance Requirements section, through the defined terms used there, states that success criteria be met through accessibility-supported ways (5.2.4), where the technology is used “in the human language of the content.” Where an alternative version is used (5.2.1), it is defined as something that “provides all of the same information and functionality in the same human language.”
-For time-based media, that normally means that where the spoken language of the media is, for example, Spanish, the language used in captions, audio descriptions, and media alternatives will also be Spanish.
- +
+ Text alternatives and equivalents should match the human language of the original content (normally the default human language of the page).
+ The 5.2 Conformance Requirements section,
+ through the defined terms used there, states that success criteria be met through accessibility-supported ways (5.2.4),
+ where the technology is used in the human language of the content.
+ Where an alternative version is used (5.2.1), it is defined as something that provides all of the same information and functionality in the same human language.
+
+ For time-based media, that normally means that where the spoken language of the media is (for example) Spanish, + the language used in captions, audio descriptions, and media alternatives will also be Spanish. +