Accessibility : Guidelines & Laws

For Accessibility Guidelines , 

The internationally-recognized , Web Accessibility Guidelines (WCAG) , published by the World Wide Web Consortium (W3C) , are the most authoritative source for defining web accessibility. The W3C also published the Authoring Tool Accessibility Guidelines (ATAG) 2.0 , for applications and software that create web content.

There are small description of the guidelines :

Web Accessibility Guidelines (WCAG)

Reference : https://www.w3.org/TR/WCAG21/#intro

• Perceivable
• Operable
• Understandable
• Robust

Authoring Tool Accessibility Guidelines

The Authoring Tool Accessibility Guidelines (ATAG) 2.0 —published by the World Wide Web Consortium (W3C) — specify principles that web authoring tools (Dreamweaver, SharePoint, etc.) should follow in order to facilitate the creation of accessible web content. The guidelines mention the importance of prompting users to type in alt text for images, add labels to forms, and so on.

The guidelines are built around two focus areas:

• Make the authoring tool user interface accessible
• Support the production of accessible content

These guidelines are briefly described in mentioned website.

There are many international  laws for accessibility , which helps to implement the accessibility as per the country rules .  All the laws with the country name and various filters are mentioned here :
 
https://www.w3.org/WAI/policies/