Skip to main content
Free WCAG education

Accessibility Learn Hub

Code-first guides for fixing the most common web accessibility failures. Each lesson includes the broken pattern, the correct fix, and framework-specific examples.

12lessons
8categories
~97min total
WCAG 2.2aligned

Images

1 lesson
WCAG 1.1.1

Missing Alt Text on Images

Images must have text alternatives that describe the content or function of the image.

5 minEasy

Color

1 lesson
WCAG 1.4.3

Insufficient Color Contrast

Text must have a contrast ratio of at least 4.5:1 against its background (3:1 for large text ≥18pt or bold ≥14pt).

10 minMedium

Forms

2 lessons
WCAG 1.3.1

Form Fields Without Labels

Every form input must have a programmatic label — either a <label> element, aria-label, or aria-labelledby.

5 minEasy
WCAG 4.1.2

Inaccessible Button Patterns

Buttons must use the <button> element or role="button" with full keyboard support. Using <div> or <span> for buttons is a common accessibility failure.

5 minEasy

Structure

2 lessons
WCAG 1.3.1

Broken Heading Structure

Headings (h1–h6) must form a logical, nested hierarchy. Skipping levels and using headings for visual styling breaks navigation for screen reader users.

5 minEasy
WCAG 3.1.1

Missing or Wrong Language Attribute

The <html> element must have a lang attribute so screen readers use the correct language, pronunciation rules, and voice.

2 minEasy

Navigation

2 lessons
WCAG 2.4.4

Uninformative Link Text

Link text must describe the destination or purpose of the link. "Click here" and "Read more" are meaningless when read out of context.

5 minEasy
WCAG 2.4.1

Missing Skip Navigation Links

Pages with repeated navigation must provide a way to skip directly to the main content, so keyboard users don't have to tab through the same nav links on every page.

10 minEasy

Keyboard

2 lessons
WCAG 2.1.1

Elements Not Keyboard-Accessible

All interactive functionality must be operable with a keyboard alone. Users who can't use a mouse depend entirely on keyboard navigation.

10 minMedium
WCAG 2.4.7

Missing or Hidden Focus Indicators

Keyboard users must be able to see which element is focused. Removing the browser's default outline without a replacement is a common and serious barrier.

5 minEasy

ARIA

1 lesson
WCAG 4.1.2

Missing ARIA Labels on Interactive Elements

Interactive elements (buttons, inputs, landmarks) must have an accessible name so assistive technology can announce what they do.

5 minEasy

Multimedia

1 lesson
WCAG 1.2.2

Videos Without Captions

All pre-recorded video with audio must have synchronized captions. This serves deaf/hard-of-hearing users and anyone in a noisy or silent environment.

30 minHard

See these issues on your own site

ADAGuard automatically detects all 12 of these patterns and dozens more — in seconds.

Free scan