International IEC ISO Standard ISO/IEC 20071-20 Information technology User First edition interface component accessibility - 2025-07 Part 20: Developing audiovisual content TechnologiesdeI'informationAccessibiliteducomposant interfaceutilisateur Partie20:Développementdecontenuaudiovisuel Reference number ISO/IEC20071-20:2025(en) ISO/IEC 2025 IS0/IEC20071-20:2025(en) COPYRIGHT PROTECTEDDOCUMENT @IS0/IEC2025 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or ISo's member body in the country of the requester. ISO copyright office CP 40i: Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email:[email protected] Website: www.iso.org Published in Switzerland IS0/IEC 2025-All rights reserved ii IS0/IEC20071-20:2025(en) Contents Page Foreword. .iv Introduction 1 Scope. .1 2 NormativeReferences .1 3 Terms and definitions 1 3.1 Content and content components 2 3.2 Informationandimportance. 4 3.3 Descriptors of content. 4 4 Developing accessible audiovisual content 5 4.1 General 5 4.2 Providing visual alternatives toaudio information .5 .5 4.3 Providing audio alternative to visual information 4.4 Providing an alternative tovisual text. .6 4.5 Providing information in a language that the user understands .6 4.6 Providinginformationthatsupportsunderstanding 6 4.7 Controllingtheuseofaccessibilitycomponents .6 4.7.1 Choosing accessibility components .6 4.7.2 Interactingwithaudiovisual contentatone'sownpace .7 5 Translations and localizations 7 5.1 Translating orlocalizingaccessibility content. .7 5.2 Intended presentationstyleoftranslations .7 6 Timing and importance of information 7 6.1 Timingconsiderations. 7 6.1.1 Real time considerations. .7 6.1.2 Synchronization .8 6.1.3 Optional extended time considerations. .8 6.2 Levels of importance .8 6.2.1 General .8 6.2.2 Essential information. .8 6.2.3 Significantinformation .9 6.2.4 Helpful information .9 6.2.5 Unhelpful information. .9 7 Creating accessibility components 9 7.1 Developingaccessibilitycomponents .9 7.2 Importantskillsforcreatorsofaccessibilitycomponents .9 7.3 Contentgenreand program category .10 7.4 Scripting.. .10 7.5 Inclusion oftypical users in theprocessof creating accessibilitycontent .10 7.6 ..10 Evaluation 7.7 Evaluations including contribution of typical users .10 Bibliography 11 @IS0/IEC 2025-All rights reserved ii IS0/IEC20071-20:2025(en) Foreword ISo (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)form the specialized system for worldwide standardization. National bodies that are members of IsO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IsO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, inliaison with IsO and IEC,alsotake part in thework. Theprocedures used todevelopthis documentand those intended foritsfurthermaintenanceare described in theIso/lEc Directives, Part 1.In particular, the different approval criteria neededfor the different types of documents should be noted.This document was drafted in accordance with the editorial rules ofthe Iso/ IEc Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members experts/refdocs). Iso and IEC draw attention to the possibility that the implementation of this document may involve the claimed patent rights in respect thereof. As of thedate of publication of this document,Iso and IEC havenot received notice of (a)patent(s) which may berequired to implementthis document