WCAG and WAI-ARIA for more accessible web applications
Even since writing Responsive Web Design with HTML5 and CSS3 - First Edition, Packt Publishing from 2011 to 2012, the W3C has made strides in making it easier for authors to write more accessible web pages.
WCAG
The WCAG exists to provide:
"a single shared standard for web content accessibility that meets the needs of individuals, organizations, and governments internationally."
When it comes to more pedestrian web pages (as opposed to single page web applications and the like) it makes sense to concentrate on the WCAG guidelines. They offer a number of (mostly common sense) guidelines for how to ensure your web content is accessible. Each recommendation is rated as a conformance level: A, AA, ...
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