Text Alternatives for Images
Meaningful images must include text alternatives so screen readers can convey information.
Section 508
Section 508 of the Rehabilitation Act requires US federal agencies to make their digital content accessible. It covers federal websites, software and documents, based on WCAG.
Free check against the Section 508

Section 508 requires digital content to be accessible for people with disabilities. It formally adopts WCAG Level AA as the standard for web content, with compliance assessed through clear, testable criteria.
Meaningful images must include text alternatives so screen readers can convey information.
All interactive elements must be usable with a keyboard without requiring a mouse.
Prerecorded videos with audio must provide captions for users who cannot hear.
Text and interactive elements must meet minimum contrast ratios for readability.
Text must be resizable up to 200% without loss of content or functionality.
Headings and form labels must describe their purpose and structure content clearly.
Navigation mechanisms must remain consistent across pages of the website.
Input errors must be clearly identified and described to help users correct them.
The default language of each page and language changes must be defined in code.
Content must be robust enough to work with screen readers and similar tools.
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