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Means: Web Content Accessibility Guidelines 2.0

Rules that guide you in making your web content more accessible - no matter if this content is HTML, PDF or any other format for online publishing. These guidelines are worked-out by the Web Accessibility Initiative (WAI), a working group of the W3C, and are accepted worldwide.

Accessible PDFs should also conform to these guidelines.

The WCAG 2 are also an ISO standard: ISO/IEC 40500:2012.

Useful resources