RAWeb 1.1 — Accessible Code Development Guide

You are an accessibility-aware developer. Every piece of HTML, CSS, and JavaScript you write MUST conform to RAWeb 1.1 (Level AA by default). RAWeb is Luxembourg's official web accessibility framework implementing EN 301 549 and WCAG 2.1.

How to use the reference data

The full RAWeb 1.1 criteria, test methodologies, and glossary are available as JSON files. Use the lookup script to query specific criteria on demand:

# List all topics
!`${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh topics`

# Look up a specific criterion
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh criterion 1.1

# Look up test methodology
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh methodology 1.1.1

# Search criteria by keyword
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh search "form"

# Check glossary definition
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh glossary "text alternative"

The raw JSON reference files are located at:

• ${CLAUDE_SKILL_DIR}/references/criteres.json — All 136+ criteria with tests and WCAG/EN 301 549 mappings
• ${CLAUDE_SKILL_DIR}/references/methodologies.json — Step-by-step test procedures
• ${CLAUDE_SKILL_DIR}/references/glossaire.json — Glossary of accessibility terms
• ${CLAUDE_SKILL_DIR}/references/themes.json — Topic names
• ${CLAUDE_SKILL_DIR}/references/niveaux.json — WCAG conformance levels per criterion

When writing code for a specific component, ALWAYS look up the relevant RAWeb criteria first to ensure full compliance. For example, before writing a form, run search "form" and topic 11.

Core rules (apply to ALL code you write)

1. Images (Topic 1)

ALWAYS:

• Every <img> conveying information MUST have a meaningful alt attribute (1.1)
• Every decorative <img> MUST have alt="" and no title, aria-label, or aria-labelledby (1.2)
• Every <svg> conveying information MUST have role="img" — this one is mandatory, 1.1.5 invalidates the

test without it — plus a text alternative via aria-label, aria-labelledby, or a <title> child (1.1)

• Decorative <svg> MUST have aria-hidden="true" (1.2)
• Every text alternative MUST be relevant — it must convey what the image conveys (1.3), **and short and

concise* (test 1.3.9). RAWeb's glossary defines short and concise* as "a maximum length of 80 characters is strongly recommended" — the 80 is a strong recommendation, but brevity itself is tested by 1.3

• Complex images (charts, infographics) need a detailed description (1.6) — but **the accepted routes differ

by element type**:

• <img>, <object>, <embed>: only two routes — a text alternative referencing an adjacent detailed

description, or an adjacent link/button to it. `aria-describedby` is not a route here (1.6.1–1.6.3)

• <input type="image">, <svg>, role="img": aria-describedby is accepted, alongside

aria-label/aria-labelledby and the adjacent link/button (1.6.4, 1.6.5, 1.6.10)

• <canvas>: also accepts a detailed description placed between <canvas> and </canvas> (1.6.7)
• Whichever you use, it must actually resolve for AT — tests 1.6.6, 1.6.8 and 1.6.9 validate the wiring

rather than grant a route

• Avoid images of text unless a replacement mechanism exists, or the visual effect cannot be reproduced

in CSS — 1.8 accepts either escape (1.8 — Level AA)

• Where an image has a visible caption, that caption MUST be correctly linked to the image — <figure>/<figcaption> (1.9)

NEVER:

• Leave alt undefined on an informative image
• Use alt="image", alt="photo", alt="icon" — describe what the image conveys
• Use title as the sole text alternative (poor assistive technology support)

<!-- GOOD: informative image -->
<img src="chart.png" alt="Sales increased 40% in Q3 2024">

<!-- GOOD: decorative image -->
<img src="decoration.svg" alt="">

<!-- GOOD: complex image with detailed description -->
<figure>
  <img src="orgchart.png" alt="Company organisation chart. Full description below.">
  <figcaption>
    <details>
      <summary>Full description of the organisation chart</summary>
      <p>The CEO reports to the board. Three departments report to the CEO...</p>
    </details>
  </figcaption>
</figure>

<!-- GOOD: SVG informative -->
<svg role="img" aria-label="Warning: connection unstable">
  <use href="#icon-warning"/>
</svg>

<!-- GOOD: SVG decorative -->
<svg aria-hidden="true" focusable="false"><use href="#flourish"/></svg>

2. Frames (Topic 2)

• Every <iframe> MUST have a descriptive title attribute (2.1)
• The title must be relevant to the frame content (2.2)

<iframe src="map.html" title="Interactive map of our office locations"></iframe>

3. Colours (Topic 3)

• Information must NEVER be conveyed by colour alone (3.1) — and RAWeb requires both complements, not

either: additional information in the code (aria-label, visually hidden text, aria-current…) and an additional visual cue (icon, shape, position, typographic effect). An icon alone does not discharge 3.1. Applies to text, colour named in text ("click the green button"), images, CSS properties, and media

• Text contrast ratio: at least 4.5:1, or 3:1 for large text — which RAWeb defines in px:

≥24px non-bold, ≥18.5px bold (3.2 — Level AA)

• Non-text elements (icons, borders, UI components): at least 3:1 contrast against adjacent colours (3.3)
• Both 3.2 and 3.3 also accept a mechanism that lets the user display a compliant ratio; if you ship one,

it must itself be compliant (3.2.5, 3.3.4)

<!-- BAD: colour alone conveys meaning -->
<span class="text-red">Required field</span>

<!-- GOOD: colour + text indicator -->
<span class="text-red">Required field *</span>
<span class="sr-only">(required)</span>

<!-- Or better with native HTML -->
<input type="text" required aria-required="true">

4. Multimedia (Topic 4)

• Pre-recorded video with audio MUST have captions (4.3 — captions are 4.3, not 4.1; 4.1 is the

transcript/audio-description criterion). Captions delivered via <track> MUST use kind="captions" (4.3.2). Live synchronised media needs captions too (4.3.3)

• Pre-recorded audio MUST have a text transcript (4.1)
• Pre-recorded video MUST have audio description if visual information is not in the audio track (4.5, 4.6 — Level AA)
• Every automatically triggered sound MUST be controllable by the user — stop it, or control its volume

independently of the system volume (4.10). Exempt if the sequence lasts 3 seconds or less

• Media viewing controls MUST exist (4.11.1): at least play/pause or stop; sound on/off if there is

sound; a captions toggle if there are captions; an audio-description toggle if there is AD. Each MUST then be operable by keyboard AND any pointing device (4.11.2/4.11.3)

• Time-based and non-time-based media MUST be compatible with assistive technologies (4.13)
• Interactive <canvas>/<svg> content is non-time-based media: it MUST have an alternative reachable

via a clearly identifiable adjacent link or button (4.8), that alternative MUST give the same content and similar features (4.9), and its controls MUST be keyboard- and pointer-operable (4.12)

These have no WCAG equivalent — they are EN 301 549 §7 requirements that no WCAG-based scanner reports:

• Caption and audio-description toggles MUST be presented at the same level as play/pause — not buried

one extra click deep in a menu (4.14 — Level AA)

• Any transmit/convert/record feature MUST preserve captions (4.15) and audio description (4.16) — Level AA
• Caption presentation MUST be user-controllable: honour the OS caption settings, or provide an on-page

control (4.17 — Level AA)

• Subtitles MUST be vocalisable — a spoken-subtitle track, a TTS feature, or an alternative version

(4.18 — Level AA)

<video controls>
  <source src="presentation.mp4" type="video/mp4">
  <track kind="captions" src="captions-en.vtt" srclang="en" label="English" default>
  <track kind="descriptions" src="descriptions-en.vtt" srclang="en" label="English audio descriptions">
</video>

5. Tables (Topic 5)

• Every complex data table MUST have a summary (5.1) — in the <caption> or a passage of text linked by

aria-describedby, not the obsolete summary attribute — and that summary must be relevant (5.2). A table is "complex" when its headers are not confined to the first row and/or first column, or a header's scope is not valid for the whole row/column

• For each layout table, the linearised content must remain comprehensible and the <table> MUST

carry role="presentation" — 5.3 requires both

• Where a data table has a title, it MUST be correctly associated — <caption>, aria-label, or aria-labelledby (5.4) — and the title must be relevant (5.5)
• Data tables MUST declare headers that span a whole column/row with <th> or role="columnheader"/

role="rowheader" (5.6.1/5.6.2). A header that does not span the whole row/column must use <th> — no ARIA route there (5.6.3)

• Each cell MUST be associated with its headers: scope for simple tables, headers/id for complex ones (5.7).

Use scope="rowgroup"/scope="colgroup" for header groups (5.7.6). A <th> that does not span the whole row/column must have a unique id and must not carry scope or a header role (5.7.3)

• Layout tables MUST NOT use <th>, <caption>, <thead>, <tfoot>, role="rowheader"/"columnheader",

a summary attribute, or scope/headers/axis on cells (5.8)

Note: 5.4 requires correct association of a title that exists — it does not itself mandate one. In practice always give a data table a <caption>; just don't cite 5.4 as the reason.

<!-- GOOD: simple data table -->
<table>
  <caption>Q3 2024 Revenue by Region</caption>
  <thead>
    <tr>
      <th scope="col">Region</th>
      <th scope="col">Revenue</th>
      <th scope="col">Growth</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">Europe</th>
      <td>€2.4M</td>
      <td>+12%</td>
    </tr>
  </tbody>
</table>

6. Links (Topic 6)

• Every link MUST have an accessible name (6.2), and that name must be explicit (6.1)
• Links with identical accessible names MUST lead to the same destination, or be distinguished by their

context (6.1.6)

• The link's accessible name must be relevant and describe the destination or function (6.1)
• Avoid ambiguous link text: never use "click here", "read more", "learn more" without context (6.1)
• If the visible text is not sufficient, add context via aria-label or aria-labelledby — but the

aria-label MUST include the visible text (6.1, test 6.1.5 — Label in Name)

<!-- BAD -->
<a href="/report.pdf">Click here</a>

<!-- GOOD -->
<a href="/report.pdf">Download the Q3 2024 financial report (PDF, 2.4 MB)</a>

<!-- GOOD: contextual with aria-label containing visible text -->
<article>
  <h3>RAWeb 1.1 released</h3>
  <p>The new version adds 17 additional criteria...</p>
  <a href="/news/raweb" aria-label="Read more about RAWeb 1.1 released">Read more</a>
</article>

7. Scripts (Topic 7)

• Every script-driven UI MUST be compatible with assistive technologies — correct role, name, and value (7.1)
• Where a script has an alternative, that alternative MUST be relevant (7.2)
• Every script MUST be accessible and operable by keyboard AND any pointing device (7.3)
• Any script that initiates a change of context MUST warn the user beforehand or leave them in control (7.4)
• Status messages MUST be communicated without moving focus (7.5 — Level AA). RAWeb maps **message type to

technique** — the wrong role for the type fails the test:

Every aria-live branch requires `aria-atomic="true"` alongside it — bare aria-live="polite" fails 7.5.1. aria-relevant is not a technique 7.5 recognises; it satisfies nothing here

• A script MUST NOT remove focus from an element that receives it (7.3.2)

Related criteria that live in other topics — do not cite them as Topic 7:

• Moving or blinking content must be controllable (pause, stop, hide) → 13.8
• Sudden changes in brightness / flashing → 13.7
• Keyboard traps → 12.9

<!-- GOOD: live region for status updates -->
<div role="status" aria-live="polite" aria-atomic="true">
  <p>3 results found.</p>
</div>

<!-- GOOD: alert for important messages -->
<div role="alert">
  <p>Your session will expire in 2 minutes.</p>
</div>

// GOOD: keyboard + pointer support
button.addEventListener('click', handler);  // covers mouse + Enter/Space
button.addEventListener('keydown', (e) => {
  if (e.key === 'Enter' || e.key === ' ') {
    e.preventDefault();
    handler(e);
  }
});

8. Mandatory Elements (Topic 8)

• Every page MUST have a valid <!DOCTYPE html> (8.1)
• Every page MUST have a lang attribute on <html> (8.3); its code must be valid and relevant to the

page's main language (8.4)

• Language changes in content MUST be marked with lang on the relevant element (8.7 — Level AA)
• Every page MUST have a unique and relevant <title> (8.5, 8.6)
• In an SPA, update the page <title> when the view changes — a title left at "Home" across views stops

being relevant, which is what 8.6 tests (8.6 tests relevance; the update rule is the practical consequence)

• No duplicate id attributes in the page (8.2)
• Opening and closing tags must be used per specification; nesting must be valid (8.2 — source-code

validity. 8.1 is only the presence of a document type)

• Text whose reading direction differs from the page default must sit in a tag with a dir attribute

(8.10), and that value must be a valid, relevant rtl/ltr (8.10.2)

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Contact Us — Acme Corp</title>
</head>
<body>
  <p>Visit our <span lang="fr">bureau principal</span> in Luxembourg.</p>
</body>
</html>

9. Information Structure (Topic 9)

• Use headings (<h1>–<h6>, or role="heading" + aria-level) with a logical hierarchy (9.1.1). Each

heading's text must be relevant (9.1.2), and every passage of text that acts as a heading must be marked up as one (9.1.3) — a styled <div class="title"> fails 9.1.3 even when the hierarchy is clean

• Use the landmarks 9.2.1 actually requires: <header>→banner, <nav>→navigation,

`<search>`→`search`, <main>→main, <footer>→contentinfo. (<aside>/complementary is fine to use but is not required by 9.2)

• Exactly one visible main, banner and contentinfo per page, and reserve navigation for primary

and secondary navigation only (9.2.2)

• A <header>/<footer> without an explicit role must not be nested inside article, complementary,

main, navigation or section (9.2.3/9.2.4) — a <header> inside <main> fails

• Use lists (<ul>, <ol>, <dl>) for list content (9.3)
• Use <q> for short inline quotations (9.4.1) and <blockquote> for quotation blocks (9.4.2). cite is

good practice — 9.4 does not test it

<body>
  <header role="banner">
    <nav aria-label="Main navigation">...</nav>
  </header>
  <main role="main">
    <h1>Page Title</h1>
    <section aria-labelledby="section-heading">
      <h2 id="section-heading">Section</h2>
      <h3>Sub-section</h3>
    </section>
  </main>
  <footer role="contentinfo">...</footer>
</body>

10. Presentation of Information (Topic 10)

• Content must remain readable and functional at 200% zoom (10.4 — Level AA)
• Content must reflow at 320px CSS width without horizontal scrolling — and, for vertically-read content, at

256px height without vertical scrolling (10.11 — Level AA)

• Use CSS for all visual presentation. 10.1 forbids an enumerated set — <font>, <center>, <big>,

<blink>, <marquee>, <s>, <strike>, <tt> and attributes like align, bgcolor, border, cellpadding, hspace, valign, vspace. `width`/`height` remain allowed on <canvas>, <embed>, <iframe>, <img>, <object>, <source>, <svg> (10.1.2) — keep them on images to prevent layout shift

• Never use spaces to separate letters in a word, or to simulate tables or columns (10.1.3)
• Visible content that conveys information must be reachable by AT — a CSS background image carrying meaning

needs a text alternative on the page (10.2). Separately, the reading order must stay understandable with CSS disabled (10.3)

• Visible focus indicator on all interactive elements, with a contrast ratio ≥ 3:1 (10.7)
• Do not hide content in a way that becomes unreachable (10.8)
• Text spacing: users must be able to override line-height (1.5×), paragraph spacing (2×), letter-spacing (0.12em), word-spacing (0.16em) without loss of content (10.12 — Level AA)

/* GOOD: visible focus indicator */
:focus-visible {
  outline: 3px solid #0056b3;
  outline-offset: 2px;
}

/* GOOD: ensure reflow support */
.container {
  max-width: 100%;
  overflow-wrap: break-word;
}

/* NEVER: hide focus outline globally */
/* *:focus { outline: none; } ← FORBIDDEN */

11. Forms (Topic 11)

This is a critical topic. Always look up criteria with `bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh topic 11` when implementing forms.

• Every form field MUST have a programmatically associated label (11.1). Always give it a visible one

too — that is 11.4 (label next to its field) plus good practice; 11.1 itself also accepts aria-label or title with nothing visible

• Label association: <label for="id">, aria-labelledby, aria-label, or title (11.1)
• The <label> element with for attribute is the preferred method (11.1)
• The accessible name MUST include the visible label text (11.2)
• Labels must be relevant — clearly describe the expected input (11.2)
• Labels for fields with the same function MUST stay consistent across the set of pages (11.3 — Level AA)
• The label MUST sit next to its field (11.4): immediately above or left for normal fields (LTR), and

immediately below or right for checkbox, radio, and role="switch"

• Related fields MUST be grouped — <fieldset>, role="group", or role="radiogroup" for radios (11.5)
• Every group MUST have a legend (11.6): <legend> in a <fieldset>, or aria-label/aria-labelledby

on a role="group"/role="radiogroup". The legend must be relevant (11.7)

• Group <select> options of the same type with <optgroup>, each with a relevant label (11.8)
• Button labels MUST be relevant, and the accessible name MUST contain at least the visible label (11.9)
• Required fields must be indicated before the form or at the field level (11.10)
• Use required and/or aria-required="true" for mandatory fields (11.10) — **and keep a visible

indication**: the attribute alone passes 11.10.1 but fails 11.10.2, which applies specifically to fields carrying required/aria-required and demands a visible indication in the label, an associated passage of text, or the legend

• Error messages MUST identify the field by name and be linked to it via aria-invalid="true"

(11.10 — Level A)

• Error messages MUST also suggest the expected data type/format and examples of valid values

(11.11 — Level AA)

• Forms that modify or delete data, submit exam answers, or carry financial/legal consequences MUST be

reversible, checkable before submit, or explicitly confirmed (11.12 — Level AA)

• Input purpose for personal data must use autocomplete with appropriate values (11.13 — Level AA)

Note: *error identification is 11.10 (Level A); 11.11 is only error suggestion (AA). Linking a message to its field is 11.10, not 11.11 — filing it under 11.11 downgrades a Level A requirement. `<legend>` is 11.6*, not 11.5 — 11.5 is the grouping alone.

<form novalidate>
  <fieldset>
    <legend>Personal information</legend>

    <div>
      <label for="fname">First name <span aria-hidden="true">*</span></label>
      <input type="text" id="fname" name="fname"
             autocomplete="given-name"
             required aria-required="true"
             aria-describedby="fname-error">
      <p id="fname-error" role="alert" class="error" hidden>
        Please enter your first name.
      </p>
    </div>

    <div>
      <label for="email">Email address <span aria-hidden="true">*</span></label>
      <input type="email" id="email" name="email"
             autocomplete="email"
             required aria-required="true"
             aria-describedby="email-hint email-error">
      <p id="email-hint" class="hint">Format: [email protected]</p>
      <p id="email-error" role="alert" class="error" hidden>
        Please enter a valid email address (e.g., [email protected]).
      </p>
    </div>
  </fieldset>

  <button type="submit">Submit</button>
</form>

12. Navigation (Topic 12)

• At least two navigation mechanisms among: main nav, sitemap, search engine (12.1 — Level AA)
• Repeated content blocks must be reachable or avoidable (12.6) — a landmark role, a heading, a hide

button, or a skip link all satisfy it

• A skip link to the main content region must be present and functional (12.7)
• Skip links must be visible on focus (12.7)
• Tab order must be logical and consistent (12.8), and must stay consistent after a script inserts or

updates content — reposition focus correctly (12.8.2)

• Avoid positive tabindex values — they almost always break the coherent order 12.8.1 requires. (12.8

tests the order, not the attribute; RAWeb notes the sequence need not follow natural reading order as long as it stays coherent.)

• Navigation MUST NOT contain keyboard traps (12.9) — a modal's Tab loop is legal only because Escape and a close button let the user out
• Single-key shortcuts must be remappable or disableable (12.10)
• Content appearing on hover or focus (tooltips, popovers) must be keyboard accessible (12.11 — Level AA)
• Menus and navigation bars must stay in the same place in the presentation and the **same relative

order in the source** across the set of pages (12.2 — Level AA)

• Indicating the active page (e.g. aria-current="page") is good practice, not a RAWeb criterion — 12.2

only tests consistent placement. Do it, but don't cite 12.2 for it

<body>
  <!-- Skip link: first focusable element -->
  <a href="#main-content" class="skip-link">Skip to main content</a>

  <nav aria-label="Main navigation">
    <ul>
      <li><a href="/" aria-current="page">Home</a></li>
      <li><a href="/about">About</a></li>
      <li><a href="/contact">Contact</a></li>
    </ul>
  </nav>

  <main id="main-content" tabindex="-1">
    <!-- Page content -->
  </main>
</body>

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: #000;
  color: #fff;
}
.skip-link:focus {
  top: 0;
}

13. Consultation (Topic 13)

• The user must have control over every time limit that modifies content — adjustable, extendable, or removable (13.1)
• A <meta http-equiv="refresh"> redirect admits no user control: it must be immediate (content="0")

or at least twenty hours (content ≥ 72000) (13.1.2)

• A new window MUST NOT open without a user action (13.2)
• Every downloadable office document must have an accessible version (13.3), and that version must offer the same information (13.4)
• Sudden changes in brightness or flashing must be used correctly — no more than 3 flashes per second, or

a cumulative effect area ≤ 21824 px² (13.7). Applies to media, scripted effects, and CSS animation alike

• Moving or blinking content must be controllable by the user: stop/restart, show/hide, or offer the same

information without the movement (13.8). Exempt if it lasts ≤ 5 seconds. Pausing on focus only does not count; content that cannot be stopped (a progress bar) is NA

• Content must be viewable in any screen orientation (13.9 — Level AA)
• Any feature using a complex gesture must also be usable with a simple gesture (13.10) — this covers

multi-touch (13.10.1) and path-based gestures (13.10.2). A drag with no single-point alternative — a slider that only drags, a splitter with no reset — fails 13.10.2. Widely missed, because 13.10 reads as though it were only about pinch

• Single-point actions must be cancellable (13.11): trigger on release, or on press-then-cancel-on-

release, or provide an abort/undo mechanism

• Motion-actuated features must work via UI components instead (13.12), and the user must be able to

disable motion detection entirely (13.12.3)

• Biometric identification or control (fingerprint, face, voice) MUST have an alternative — non-biometric,

or a sufficiently different biological characteristic (13.14). EN 301 549 §5.3, Level A, no WCAG equivalent

• Document conversion features must preserve accessibility information (13.13 — Level AA, EN 301 549 §5.4)

Note: indicating a link's file format and size is good practice, not a RAWeb criterion — do it, but do not cite 13.3 for it. Warning the user before a context change is 7.4, not 13.1.

<!-- GOOD: file download with format and size -->
<a href="/report.pdf">
  Annual report 2024 <span class="file-info">(PDF, 3.2 MB)</span>
</a>

<!-- GOOD: new window warning -->
<a href="https://external.example.com" target="_blank"
   rel="noopener noreferrer">
  External resource
  <span class="sr-only">(opens in a new window)</span>
</a>

Component patterns (WAI-ARIA APG)

When building interactive components, look up the correct ARIA pattern from the local reference data BEFORE writing any code. The component library contains 30 patterns extracted from the WAI-ARIA Authoring Practices Guide with keyboard interactions, required/optional ARIA attributes, and implementation notes.

How to use

# Find the right pattern by keyword (e.g., "modal", "dropdown", "toggle")
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-component-lookup.sh find "<keyword>"

# Show the pattern contract as markdown tables:
# RAWeb criteria + keyboard interaction + ARIA roles/attributes/states
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-component-lookup.sh show <slug>

# Show working code examples (do + don't) for one framework
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-component-lookup.sh code <slug> [vanilla|react|angular|web-component]

# List all 30 available patterns
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-component-lookup.sh list

# Find patterns that use a specific ARIA role
bash ${CLAUDE_SKILL_DIR}/scripts/raweb-component-lookup.sh roles "<role>"

Workflow

1. Identify the component the developer is building (dialog, tabs, slider, etc.)
2. Search using find with the most natural keyword the developer used
3. Load the contract with show <slug> — the RAWeb criteria that apply, the

keyboard interaction, and every ARIA attribute with its allowed values/states

1. Load the code with code <slug> — read the whole pattern file the first

time; use code <slug> <framework> when you already know the universal rules

1. Apply the pattern, preferring native HTML elements over ARIA roles
2. Cross-reference anything the pattern doesn't cover against the criteria —

especially Topics 7 (Scripts), 11 (Forms), and 12 (Navigation)

If a pattern has no code examples yet, code tells you so and lists what does. Fall back to show <slug> — the contract is complete for all 30 patterns.

Where the data lives

Criterion levels and official titles are resolved at render time from niveaux.json and criteres.json, so a pattern can never quote a stale level. Never retype an ARIA table into a .md — add it to the JSON and let show render it.

Quick mapping: common requests → pattern slugs

Screen-reader-only utility class

Always include and use this utility in your CSS:

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

Pre-commit checklist (apply before finalizing any code)

Before considering any code complete, verify:

• [ ] All images have appropriate alt (informative) or alt="" (decorative)
• [ ] All form fields have associated labels
• [ ] Colour is never the sole means of conveying information
• [ ] All interactive elements are keyboard accessible
• [ ] Focus order is logical and follows visual order
• [ ] Focus indicator is visible on all interactive elements
• [ ] Page has valid lang attribute and language changes are marked
• [ ] Page has a unique, descriptive <title>
• [ ] Headings follow a logical hierarchy (no skipped levels)
• [ ] Semantic HTML elements are used (<nav>, <main>, <header>, <footer>)
• [ ] ARIA attributes are used correctly (prefer native HTML semantics first)
• [ ] Dynamic content changes are announced to assistive technologies
• [ ] No auto-playing media or animation without user control
• [ ] Links opening new windows are indicated

When in doubt

1. Look up the RAWeb criterion: bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh criterion <topic.criterion>
2. Check the test methodology: bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh methodology <topic.criterion.test>
3. Look up the ARIA pattern for a component: bash ${CLAUDE_SKILL_DIR}/scripts/raweb-component-lookup.sh find "<keyword>", then show <slug> for the contract and code <slug> for worked examples
4. Consult the glossary for precise definitions: bash ${CLAUDE_SKILL_DIR}/scripts/raweb-lookup.sh glossary "<term>"
5. Default to the most accessible approach — when two implementations are possible, choose the one with better assistive technology support
6. Prefer native HTML semantics over ARIA: a <button> is better than <div role="button">
7. When building an interactive widget, ALWAYS load the APG pattern first — do not guess ARIA attributes from memory
8. Never cite a criterion number from memory. RAWeb numbering is not WCAG

numbering: RAWeb 7.3 is keyboard operability, WCAG 2.1.1 is. Verify with criterion <x.y> before writing a number into code, a comment, or a report