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1. Introduction

To address the evolving needs of digital accessibility, the World Wide Web Consortium (W3C) published the Web Content Accessibility Guidelines (WCAG) 2.1 on 5 June 2018. As a minor version update, WCAG 2.1 extends WCAG 2.0, which was published on 11 December 2008, by including 17 new success criteria that focus on improving accessibility for persons with low vision and cognitive disabilities and persons with physical disabilities who browse websites on mobile devices.

According to W3C, the publication of WCAG 2.1 does not deprecate or supersede WCAG 2.0, and both WCAG 2.0 and WCAG 2.1 are prevailing standards. We advise organisations to adopt the new success criteria of WCAG 2.1, where appropriate, when carrying out major website revamps or developing new websites to enhance accessibility for persons with disabilities.

This handbook is designed to illustrate how the new success criteria in WCAG 2.1 can be successfully implemented. For details of success criteria in WCAG 2.0, please refer to

More information about WCAG and its supporting resources can be found at:


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