WCAG — the Web Content Accessibility Guidelines — is the international standard that defines what makes a website accessible to people with disabilities. If you've received an ADA demand letter, talked to a web developer about compliance, or just want to understand your legal exposure, WCAG is the standard at the center of everything.
WCAG stands for Web Content Accessibility Guidelines. It was created by the World Wide Web Consortium (W3C), the same international organization that maintains the standards for HTML and CSS. WCAG is not a law itself — but US courts have consistently cited WCAG 2.1 Level AA as the standard for ADA website compliance. When a plaintiff attorney says your website violates the ADA, they are almost always measuring against WCAG 2.1 AA.
WCAG is organized around four principles known by the acronym POUR. Perceivable means all content must be presentable in ways users can perceive — images need alt text so screen readers can describe them. Operable means all functionality must be operable via keyboard, not just mouse. Understandable means content and UI must be understandable — forms need clear labels and error messages. Robust means content must be robust enough to be interpreted by current and future assistive technologies.
WCAG has three conformance levels. Level A covers the most basic accessibility requirements — failing Level A means the site is essentially unusable for many disabled users. Level AA is the standard required for ADA compliance in the US — this is what courts and regulators expect. Level AAA is the highest standard and includes requirements that are impractical for most general-purpose websites. When someone says "ADA compliant website," they mean WCAG 2.1 Level AA.
The violations that appear most frequently in ADA lawsuits and automated scans: missing alternative text on images (every image must have descriptive alt text for screen readers), insufficient color contrast (text must have a 4.5:1 contrast ratio against its background), missing form labels (every form input needs a clear, associated label), keyboard navigation barriers (all functionality must work without a mouse), missing focus indicators (users must be able to see which element has keyboard focus), and missing page language declarations (the HTML lang attribute must be set correctly).
Federal courts have generally ruled that websites serving the public are "places of public accommodation" under Title III of the ADA. When a plaintiff files an ADA website lawsuit, they document specific WCAG violations as the basis for their claim. Courts have accepted WCAG 2.1 AA as the applicable technical standard in the vast majority of cases. This means your legal exposure is directly tied to your WCAG 2.1 AA violation count — and reducing violations reduces legal risk.
ADAWebPro provides a free automated WCAG 2.1 AA scan that runs against your live website and returns a violation count, an ADA score, and a prioritized fix list in 60 seconds. No signup required. Automated scans catch the violations most commonly cited in lawsuits. Combine automated scanning with manual testing for the most complete compliance picture.
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