WCAG Levels A AA AAA
Read the Web Content Accessibility Guidelines, understand the four principles (POUR), and know which level of conformance is expected for most products.
WCAG Levels A AA AAA is a free Frontend Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Frontend Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Why Accessibility?
About 15% of the world has some form of disability. Accessible sites work for everyone: screen reader users, keyboard-only users, low-vision users, users on slow networks. Accessibility is also a legal requirement in many jurisdictions.
WCAG — Web Content Accessibility Guidelines
WCAG is the W3C standard that defines what makes web content accessible. Current version: WCAG 2.2 (October 2023). The successor WCAG 3 is in early draft.
The Four Principles (POUR)
WCAG is organised around four principles: Perceivable, Operable, Understandable, Robust. Every success criterion falls under one of them.
Perceivable
Information must be presentable in ways users can perceive: alt text for images, captions for video, sufficient colour contrast, text resizable up to 200% without loss of function.
Operable
All functionality must work via keyboard: no mouse-only interactions, enough time to read content, no flashing content that could trigger seizures, clear ways to navigate.
Understandable
Content and operation must be understandable: readable language declared, predictable navigation patterns, clear error messages with suggestions, consistent labels.
Robust
Content must work with current and future assistive technologies. Use valid HTML, follow ARIA best practices, ensure name/role/value are programmatically determinable.
WCAG Conformance Levels
Level A: minimum (must-have). Level AA: standard target (what most laws require). Level AAA: highest, not practical for entire sites — applied to critical pages only.
What Level Should You Target?
Most projects aim for WCAG 2.1 AA or 2.2 AA — the level mandated by the European Accessibility Act (EAA), Section 508 in the US, and most enterprise procurement rules.
Examples by Level
Level A: alt text on images, keyboard accessible. Level AA: contrast ratio 4.5:1 for text, no info conveyed by colour alone, focus visible, resize to 200%. Level AAA: contrast 7:1, sign language for video, context-sensitive help.
Quick Wins for AA Compliance
1) Add alt text to every image. 2) Use semantic HTML (button, nav, h1-h6). 3) Ensure colour contrast meets 4.5:1. 4) Test the site with keyboard only. 5) Add labels to every form input. 6) Use a visible focus indicator.
Quick Check
Which WCAG conformance level is the typical legal target for most websites and applications?
Recap: WCAG
WCAG 2.2 is the current standard. Four principles: Perceivable, Operable, Understandable, Robust (POUR). Three conformance levels: A (basic), AA (legal target), AAA (highest). Target AA for legal compliance. Quick wins: alt text, semantic HTML, 4.5:1 contrast, keyboard test, labelled inputs, visible focus.
Frequently asked questions
Is the “WCAG Levels A AA AAA” lesson free?
Yes — the full text of “WCAG Levels A AA AAA” is free to read here on the web, and the Frontend Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Frontend Academy course, upgrade to CoddyKit PRO.
What will I learn in “WCAG Levels A AA AAA”?
Read the Web Content Accessibility Guidelines, understand the four principles (POUR), and know which level of conformance is expected for most products. You practise Frontend Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Frontend Academy?
No prior experience is required. Frontend Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “WCAG Levels A AA AAA” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Frontend Academy lesson?
Yes. Every Frontend Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.