对于世界上有鬼吗这个问题，科学家终于找到了蛛丝
百度 笔者认为，每一个人，每一个行业都要有居安思危的意识，时刻不能停止学习的脚步，否则下一个穷途末路的或许就是你。1.1.2 Live Audio-only: All live audio-only content has a text alternative (Level AAA)
Intent of this Success Criterion
The intent of this Success Criterion is to make information conveyed by live audio, such as video conferencing, live speeches and radio Webcasts, accessible through the use of a text alternative. A live text caption service will enable live audio to be accessible to people who are Deaf or hard of hearing, or who cannot otherwise hear the audio. Such services use a trained human operator who listens in to what is being said and uses a special keyboard to enter the text with only a small delay. They are able to capture a live event with a high degree of fidelity, and also to insert notes on any non spoken audio which is essential to understanding the event. A transcript is sometimes a possibility if the live audio is following a set script; but a live caption service is preferred because it plays out at the same pace as the audio itself, and can adapt to any deviations from the script that might occur.
Using untrained operators, or providing a transcript which differs markedly from what actually happens would not be considered meeting this Success Criterion.
Examples of Success Criterion 1.1.2
A public relations firm uses Web based caption services to cover live events; the output from the service is incorporated in a sub frame of the Web page which includes the streaming audio control.
A live radio play of a fringe theatre group is being broadcast to the Web. As the actors stick largely to a set script, and the budget for the program is small, the producers provide a link (with the playwright's permission) to the script of the play.
A streaming audio server uses a media format which can also accommodate text and graphics, such as Flash or Silverlight. A stenographer is used to create live captions at an event, and these are mixed on the fly to produce live captions in the media stream which can be viewed by the media player.
A CEO is to give a press release by telephone to the media in response to a breaking news story, the audio is being recorded and streamed over the internet, but due to time constraints a Web captioning service cannot be set up in time. As the press release is a set statement which the CEO will be reading out, the company simultaneously provides the transcript of the release.
Related Resources
Resources are for information purposes only, no endorsement implied.
Techniques and Failures for Success Criterion 1.1.2 - Live Audio-only
Each numbered item in this section represents a technique or combination of techniques that the WCAG Working Group deems sufficient for meeting this Success Criterion. The techniques listed only satisfy the Success Criterion if all of the WCAG 2.0 conformance requirements have been met.
Sufficient Techniques
Providing a viewport to a live text service which is being created by a trained stenographer who transcribes the spoken audio with minimal errors (future link)
Providing a link to a text transcript of a prepared statement or script if the script is followed (future link)
G150: Providing text alternatives for live audio-only content
Additional Techniques (Advisory) for 1.1.2
Although not required for conformance, the following additional techniques should be considered in order to make content more accessible. Not all techniques can be used or would be effective in all situations.
Failures for SC 1.1.2
The following are common mistakes that are considered failures of Success Criterion 1.1.2 by the WCAG Working Group.
(No failures currently documented)