CAN CSA-ISO IEC 40500-2014 Information technology - W3C Web Content Accessibility Guidelines (WCAG) 2 0.pdf

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1、 ISO/IEC 2012. CSA Group 2014. All rights reserved. Unauthorized reproduction is strictly prohibited.CAN/CSA-ISO/IEC 40500:14(ISO/IEC 40500:2012, IDT)National Standard of CanadaCAN/CSA-ISO/IEC 40500:14InformationtechnologyW3C Web ContentAccessibility Guidelines(WCAG) 2.0(ISO/IEC 40500:2012, IDT)Lega

2、lNotice for StandardsCanadian Standards Association (operating as “CSA Group”) develops standards through a consensus standards development process approvedby the Standards Council of Canada. This process brings together volunteers representing varied viewpoints and interests to achieve consensusand

3、 develop a standard. Although CSA Group administers the process and establishes rules to promote fairness in achieving consensus,it doesnot independently test, evaluate, or verify the content of standards.Disclaimerand exclusion of liabilityThis document is provided without any representations, warr

4、anties, or conditions of any kind, express or implied, including, without limitation,implied warranties or conditions concerning this documents fitness for a particular purpose or use, its merchantability, or its non-infringementof any third partys intellectual property rights. CSA Group does not wa

5、rrant the accuracy, completeness, or currency of any of the informationpublished in this document. CSA Group makes no representations or warranties regarding this documents compliancewith any applicablestatute, rule, or regulation.IN NO EVENT SHALL CSA GROUP, ITS VOLUNTEERS, MEMBERS, SUBSIDIARIES, O

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8、R EXPENSES.In publishing and making this document available, CSA Group is not undertaking to render professional or other services for or on behalf of anyperson or entity or to perform any duty owed by any person or entity to another person or entity. The information in this document is directedto t

9、hose who have the appropriate degree of experience to use and apply its contents, and CSA Group accepts no responsibility whatsoeverarising in any way from any and all use of or reliance on the information contained in this document.CSA Group is a private not-for-profit company that publishes volunt

10、ary standards and related documents. CSA Group has no power, nor does itundertake, to enforce compliancewith the contents of the standards or other documents it publishes.Intellectualpropertyrights and ownershipAs between CSA Group and the users of this document (whether it be in printed or electron

11、ic form), CSA Group is the owner, or the authorizedlicensee,of all works contained herein that are protected by copyright, all trade-marks (except as otherwise noted to the contrary), and allinventions and trade secrets that may be contained in this document, whether or not such inventions and trade

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13、egal redress forsuch use, modification, copying, or disclosure. To the extent permitted by licence or by law, CSA Group reserves all intellectual property rights inthis document.Patent rightsAttention is drawn to the possibility that some of the elements of this standard may be the subject of patent

14、 rights. CSA Group shall not be heldresponsible for identifying any or all such patent rights. Users of this standard are expressly advised that determination of the validity of any suchpatent rights is entirely their own responsibility.Authorizeduse of this documentThis document is being provided b

15、y CSA Group for informational and non-commercial use only. The user of this document is authorized to doonly the following:If this document is in electronic form: load this document onto a computer for the sole purpose of reviewing it; search and browse this document; and print this document if it i

16、s in PDF format.Limited copies of this document in print or paper form may be distributed only to persons who are authorized by CSA Group to have such copies,and only if this Legal Notice appears on each such copy.In addition, users may not and may not permit others to alter this document in any way

17、 or remove this Legal Notice from the attached standard; sell this document without authorization from CSA Group; or make an electronic copy of this document.If you do not agree with any of the terms and conditions contained in this Legal Notice, you may not load or use this document or make anycopi

18、es of the contents hereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutesyour acceptanceof the terms and conditions of this Legal Notice.Standards UpdateServiceCAN/CSA-ISO/IEC40500:14March 2014Title: Information technology W3C Web Conte

19、nt Accessibility Guidelines (WCAG) 2.0To register for e-mail notification about any updates to this publication go to shop.csa.ca click on CSA Update ServiceThe List ID that you will need to register for updates to this publication is 2423038.If you require assistance, please e-mail techsupportcsagr

20、oup.org or call 416-747-2233.Visit CSA Groups policy on privacy at csagroup.org/legalto find out how we protect your personalinformation.CanadianStandards Association (operating as “CSA Group”), underwhose auspicesthis National Standard has been produced, waschartered in 1919 and accredited by the S

21、tandards Council of Canadato the National Standards system in 1973. It is a not-for-profit,nonstatutory, voluntary membership association engaged instandards development and certification activities.CSA Group standards reflect a national consensus of producers andusers including manufacturers, consu

22、mers, retailers, unions andprofessional organizations, and governmental agencies. Thestandards are used widely by industry and commerce and oftenadopted by municipal, provincial, and federal governments in theirregulations, particularlyin the fields of health, safety, building andconstruction, and t

23、he environment.Individuals, companies, and associationsacross Canada indicate theirsupport for CSA Groups standards development by volunteeringtheir time and skills to Committee work and supporting CSA Groupsobjectivesthrough sustaining memberships. The more than 7000committee volunteers and the 200

24、0 sustaining membershipstogether form CSA Groups total membership from which itsDirectors are chosen. Sustaining memberships represent a majorsource of income for CSA Groups standards development activities.CSA Group offers certification and testing servicesin support of andas an extension to its st

25、andards development activities. To ensurethe integrity of its certification process, CSA Group regularly andcontinually audits and inspects products that bear theCSA Group Mark.In addition to its head office and laboratory complex in Toronto, CSAGroup has regional branch offices in major centres acr

26、oss Canadaand inspection and testing agencies in eight countries. Since 1919,CSA Group has developed the necessaryexpertise to meet itscorporate mission: CSA Group is an independent service organizationwhose mission is to provide an open and effective forum foractivities facilitating the exchange of

27、 goods and servicesthrough theuse of standards, certification and related servicesto meet nationaland international needs.For further information on CSA Group services,write toCSA Group5060 Spectrum Way, Suite 100Mississauga, Ontario, L4W 5N6CanadaThe Standards Councilof Canada (SCC) is the coordina

28、ting body ofthe Canadian standardization network, which is composed of peopleand organizations involved in the development, promotion andimplementation of standards. Through the collaborative efforts ofCanadian standardization network members, standardization ishelping to advance the social and econ

29、omic well-being of Canada andto safeguard the health and safety of Canadians.The networksefforts are overseen by SCC.The principal objectives of SCC are to foster and promote voluntarystandardization as a means of advancing the national economy,supporting sustainable development, benefiting the heal

30、th, safetyand welfare of workers and the public, assisting and protecting theconsumer, facilitating domestic and international trade, andfurthering international cooperation in relation to standardization.An important facet of the Canadian standards development system isthe use of the following prin

31、ciples: consensus; equal access andeffective participation by concerned interests; respect for diverseinterests and identification of those who should be afforded accessto provide the needed balance of interests; mechanismfor disputeresolution; openness and transparency; open access by interestedpar

32、ties to the procedures guiding the standards developmentprocess; clarity with respect to the processes; and Canadian interestconsideration as the initial basis for the development of standards.A National Standard of Canada (NSC) is a standard prepared orreviewed by an SCC-accredited SDO and approved

33、 by the SCCaccording to NSC approval requirements. Approval does not refer tothe technical content of the standard, as this remains theresponsibility of the SDO. An NSC reflects a consensus of a number ofcapable individuals whose collective interests provide, to the greatestpracticable extent, a bal

34、ance of representation of general interests,producers, regulators, users (including consumers) and others withrelevant interests, as may be appropriate to the subject at hand.NSCs are intended to make a significant and timely contribution tothe Canadian interest.Those who have a need to apply standa

35、rds are encouraged to useNSCs. These standards are subjectto periodic review. Users of NSCsare cautioned to obtain the latest edition from the SDO thatpublishes the standard.The responsibility for approving standards as NSCs rests withStandards Council of Canada270 Albert Street, Suite 200Ottawa, On

36、tario, K1P 6N7CanadaCette Norme Nationale du Canada nest disponible quen anglais. Le Groupe CSA publiera la version en franais ds quelle sera produite parlorganisme rdacteur.Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remainsthe

37、responsibility of theusers to judge its suitability for their particular purpose.TMA trade-mark of the Canadian Standards Association, operating as “CSA Group”ICS 35.080ISBN 978-1-77139-519-9 2014 CSA GroupAll rights reserved.No part of this publication may be reproduced to any form whatsoever witho

38、utthe prior permission of the publisher.Published in March 2014 by CSA GroupA not-for-profit private sector organization5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6To purchase standards and related publications, visit our Online Store at shop.csa.caor call toll-free 1-800-463-6

39、727 or 416-747-4044.TMA trade-mar k of the Canadian S tandards Association, operating as “CSA Group”Reviewed byPrepared byInternational Organization for Standardization/International Electrotechnical CommissionApproved byInformationtechnology W3C WebContent AccessibilityGuidelines (WCAG) 2.0(ISO/IEC

40、 40500:2012,IDT)CAN/CSA-ISO/IEC 40500:14National Standard of CanadaCAN/CSA-ISO/IEC40500:14Information technology W3C Web Content AccessibilityGuidelines (WCAG) 2.0March 2014 2014 CSA GroupCSA/5CAN/CSA-ISO/IEC40500:14Informationtechnology W3C WebContent AccessibilityGuidelines (WCAG) 2.0(ISO/IEC 4050

41、0:2012,IDT)CSA PrefaceStandards development within the Information Technology sector is harmonized with internationalstandards development. Through the CSA Technical Committee on Information Technology (TCIT),Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC Joint Technical Committ

42、ee 1 onInformation Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO member bodyfor Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of theInternational Telecommunication Union (ITU), Canada participates in the International Telegraph and

43、Telephone Consultative Committee (ITU-T).For brevity, this Standard will be referred to as “CAN/CSA-ISO/IEC 40500” throughout.At the time of publication, ISO/IEC 40500:14 is available from ISO and IEC in English only. CSA Group willpublish the French version when it becomes available from ISO and IE

44、C.This International Standard was reviewed by the TCIT under the jurisdiction of the Strategic SteeringCommittee on Information Technology and deemed acceptable for use in Canada. From time to time,ISO/IEC may publish addenda,corrigenda, etc. The TCIT will review these documents for approval andpubl

45、ication. For a listing, refer to the Current Standards Activities page at standardsactivities.csa.ca. ThisStandard has been formally approved, without modification, by the Technical Committee and has beenapproved as a National Standard of Canada by the Standards Council of Canada. 2014 CSA GroupAll

46、rights reserved.No part of this publication may be reproducedin any form whatsoeverwithout theprior permission of the publisher. ISO/IEC material is reprinted with permission. Where the words “thisInternational Standard” appear in the text, they should be interpreted as “this National Standard ofCan

47、ada”.Inquiries regarding this National Standard of Canada should be addressed toCSA Group5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada, L4W 5N61-800-463-6727 416-747-4000http:/csa.caTo purchase standards and related publications, visit our Online Store at shop.csa.caor call toll-free1-8

48、00-463-6727or 416-747-4044.This Standard is subject to review five years from the date of publication, and suggestions for itsimprovementwill be referred to the appropriate committee. To submit a proposal for change, please sendCAN/CSA-ISO/IEC40500:14Information technology W3C Web Content Accessibil

49、ityGuidelines (WCAG) 2.0March 2014 2014 CSA GroupCSA/6the following information to inquiriescsagroup.organd include “Proposal for change” in the subjectline:a) Standard designation (number);b) relevant clause,table, and/or figure number;c) wording of the proposed change; andd) rationale for the change.CSA Technical Committeeon InformationTechnologyJ. MacFie Microsoft Canada,Ottawa, OntarioRepresenting Producer InterestChairS. Michell Maurya Software Inc.,Ottawa, OntarioRepresenting User InterestVice-ChairJ. Brub IDEgenic Inc.,Gatineau, Qube

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