YD/T 1761-2012 English PDF (YDT1761-2012)

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YD/T 1761-2012: Technical requirements for web accessibility
YD/T 1761-2012
YD
COMMUNICATION INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 33.030
M 21
Replacing YD/T 1761-2008
Technical requirements for web accessibility
ISSUED ON. DECEMBER 28, 2012
IMPLEMENTED ON. DECEMBER 28, 2012
Issued by. Ministry of Industry and Information Technology of People’s
Republic of China
Table of contents
Foreword ... 3 
1 Scope ... 6 
2 Terms and definitions ... 6 
3 Overview ... 10 
4 Perception ... 12 
4.1 Principles of perception ... 12 
4.2 Non-text processing ... 12 
4.3 Text processing ... 13 
4.4 Multimedia processing ... 14 
5 Operability ... 15 
5.1 Operational principles ... 15 
5.2 Web page operation control ... 15 
5.3 Information input processing ... 17 
6 Understandability ... 18 
6.1 Principles of understandability ... 18 
6.2 Information content processing ... 18 
6.3 Web page guidance mechanism ... 19 
6.4 Help information ... 19 
7 Compatibility ... 19 
7.1 Principles of compatibility ... 19 
7.2 Accessible web compatibility ... 20 
7.3 User interaction compatibility ... 20 
References ... 21 
Foreword
This standard was drafted in accordance with the rules given in GB/T
1.1-2009.
YD/T 1761 “Technical requirements for web accessibility” and YD/T 1822
“Testing specification for web content accessibility evaluation” form a series of
standards for website accessibility design.
This standard replaces YD/T 1761-2008 “Information accessibility for people
with physical disabilities technical requirements for web accessibility”. AND in
addition to the editorial changes the main technical changes are as follows.
- CHANGE the standard name from “Information accessibility for people
with physical disabilities technical requirements for web accessibility” into
“Technical requirements for web accessibility”;
- ADD the “perceptible principle” (SEE clause 4.1);
- MODIFY the requirements for non-textual links (level 1) (SEE clause 4.2.3;
clause 4.1.1.1, clause 5.4.2.3 and 5.4.3.4 of the 2008 version);
- MODIFY the requirements for operable non-text controls (level 1) (SEE
clause 4.2.4; clause 4.1.1.1, clause 5.4.2.3 and 5.4.3.4 of the 2008
version);
- MODIFY the requirements for non-text content (level 3) (SEE clause 4.2.5;
clause 4.1.1 of the 2008 version);
- ADD the “text size adjustment (level 3)”, “text size adjustment (level 4)”,
and “accessibility text form (level 5)” (SEE clause 4.3.1, clause 4.3.2 and
4.3.3);
- MODIFY the requirements for text comparison (level 4) (SEE clause 4.3.4;
clause 4.4.2.1 of the 2008 version);
- MODIFY the requirements for text comparison (level 5) (SEE clause 4.3.5;
clause 4.4.3.1 of the 2008 version);
- MODIFY the requirements for multimedia (level 2) (SEE clause 4.4.1;
clause 4.1.1.1 of the 2008 version);
- MODIFY the processing requirements for information that must rely on
visual and auditory perception (SEE clause 4.4.3; clause 4.2 of the 2008
version);
- ADD the “operability principle” (SEE clause 5.1);
- MODIFY the requirements for keyboard operation (level 3) and keyboard
operation (level 5) (SEE clause 5.2.1 and clause 5.2.2; clause 5.1.1 of the
2008 version);
- MODIFY the requirements for keyboard focus in (level 1) (SEE clause
5.2.3; clause 7.2.1.2 of the 2008 version);
- ADD the “skip navigation bar (level 3)”, “section skip (level 3)” and
“multimedia playback control (level 3)” (SEE clause 5.2.6, clause 5.2.7 and
clause 5.2.8);
- MODIFY the requirements for sufficient operation time (level 2) and
sufficient operation time (level 5) (SEE clause 5.2.10 and clause 5.2.11;
clause 5.2.1 of the 2008 version);
- ADD the “no floating windows (level 1)” (SEE clause 5.2.14);
- ADD the requirements for input prompt (level 2) (SEE clause 5.3.1);
- MODIFY the requirements for error cause prompt (level 3) (SEE clause
5.3.3; clause 5.5.1 of the 2008 version);
- MODIFY the requirements for error correction proposal (level 4) (SEE
clause 5.3.5; clause 5.5.2.1 of the 2008 version);
- ADD the “error prevention (level 5)” (SEE clause 5.3.7);
- ADD the “understandability principle” (SEE clause 6.1);
- MODIFY the requirements for Chinese characters (level 4) (SEE clause
6.2.3; clause 6.1.3.5 of the 2008 version);
- ADD the “chapter title (level 4)” (SEE clause 6.3.2);
- MODIFY the requirements for site search function and site map (level 3)
(SEE clause 6.3.3; clause 5.4.2.1 of the 2008 version);
- ADD the “help information (level 2)” (SEE clause 6.4.1);
- ADD the “compatibility principle” (SEE clause 7.1);
- MODIFY the requirements for the accessibility content version (level 1)
and accessibility content link location (level 1) (SEE clause 7.2.1 and 7.2.2;
clause 7.2.1.1, clause 7.2.2 and clause 7.2.3 of 2008 version);
- ADD the “accessibility content version link form (level 1)” (SEE clause
7.2.3);
- ADD the “user interaction compatibility” (SEE clause 7.3).
This standard was proposed by AND shall be under the jurisdiction of the
China Communications Standardization Association.
The drafting organizations of this standard. China Disabled Persons
Federation, China CDPF Information Center, Ministry of Industry and
Information Technology Telecommunications Research Institute, China Blind
Association, China Deaf Association, “China Shanghai” Portal Editorial
Department, China Braille Publishing House, Zhejiang University, China
Internet Association, National Elderly Work Commission Office, Harbin Billion
Times Digital Technology Development Co., Ltd., Zhejiang University Network
Technology Co., Ltd., Shanghai Wonder Information Technology Co., Ltd.
The drafters of this standard. Cui Huiping, Wu Yinghua, Sun Yongge, Wu
Yushao, Yang Kun, He Chuan, Chen Xiaohai, Li Wehong, Yang Yang, Chen
Chun, Tan Yumei, Zhu Shuangliu, Fu Minghui, Bu Jiajun, Chen Weigang,
Huang Chang, Li Li, Zhu Qingyi, Shao Lei, Xu Jie.
Technical requirements for web accessibility
1 Scope
This standard specifies the technical requirements for web design that meet
the web accessibility requirements, including the perception requirements of
web content, the operational requirements of interface components, the
understandability of web content and controls, the requirements for the ability
of content to support existing and future technologies, and so on.
This standard is applicable to to the design, development and management of
web-based accessibility service.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Information accessibility
It means all peoples, whether healthy or disabled, whether young or old, can
benefit from information technology, AND anyone in any case can obtain
and use the information in an equal, convenient, and accessible manner.
2.2
Link
It is also known as hyperlinks, which is the connection relation from a web
page to a target. The target may be another page, or the different location
on the same page, or the image, an email address, a file, or even an
application. And the object to be hyperlinked in a web page may be a
section of text or a picture. When a viewer had single clicked a linked text or
image, the link target will be displayed on the browser AND will be opened
or run depending on the type of the target. In accordance with the link path,
hyperlinks in the web page are generally divided into the following three
types. internal links, anchor links and external links...