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Accessible Components

bonsai 27b · typescript

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Inspect original source 25,779 bytes · SHA-256 d55054694dfd
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Accessible Component Showcase&lt;/parameter&gt;
&lt;/function&gt;
&lt;/tool_call&gt;
&lt;tool_call&gt;
&lt;function=ts_dom_edit&gt;
&lt;parameter=op&gt;
replace</title>
<style>
/* ── css: layout ── */
:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-accent: #4f46e5;
  --color-accent-hover: #4338ca;
  --color-focus-ring: #4f46e5;
  --radius: 8px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: var(--spacing-md);
  background: var(--color-accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 0 0 var(--radius) var(--radius);
  z-index: 10000;
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 240px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-md);
  z-index: 100;
}

.sidebar ul { list-style: none; }

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
  background: #f3f4f6;
  color: var(--color-text);
}

.nav-link:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: -2px;
}

.nav-link.active {
  background: var(--color-accent);
  color: white;
}

.main-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  min-height: calc(100vh - 240px);
}

.component-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg) var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.component-section h2 {
  font-size: 1.375rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.caption {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-lg);
  font-style: italic;
}

.widget-container {
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: #fafbfc;
  border: 1px dashed var(--color-border);
}

/* Focus styles - always visible */
button:focus-visible,
a:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 2px;
}

/* Modal styles */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-dialog {
  position: relative;
  width: 90%;
  max-width: 480px;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-dialog h3 { margin-bottom: var(--spacing-md); }

.modal-actions { display: flex; gap: var(--spacing-sm); justify-content: flex-end; margin-top: var(--spacing-lg); }

/* Dropdown styles */
.dropdown-trigger {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  font-weight: 500;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  left: 0;
  min-width: 240px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 999;
}

.dropdown-menu li { list-style: none; }

.dropdown-menu li a,
.dropdown-menu li button {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}

.dropdown-menu li:last-child { border-bottom: none; }

.dropdown-menu li:hover,
.dropdown-menu li:focus-visible {
  background: #f3f4f6;
}

/* Tabs styles */
.tablist { display: flex; gap: 0; border-bottom: 1px solid var(--color-border); margin-bottom: var(--spacing-lg); }

.tab {
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
}

.tab[aria-selected="true"] {
  color: var(--color-accent);
}

.tab[aria-selected="true"]:after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.tab:focus-visible { outline: none; }

.tab[aria-selected="true"]:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: -2px;
}

.tabpanel { display: block; padding: var(--spacing-md); }

.tabpanel[hidden] { display: none !important; }

/* Combobox styles */
.combobox-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
}

.combobox-listbox {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  left: 0;
  right: 0;
  max-height: 240px;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 999;
}

.combobox-listbox li {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  border-bottom: 1px solid var(--color-border);
}

.combobox-listbox li:last-child { border-bottom: none; }

.combobox-listbox li:hover,
.combobox-listbox li[aria-selected="true"] {
  background: #f3f4f6;
}

/* Accordion styles */
.accordion-trigger {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion-trigger[aria-expanded="true"] {
  border-color: var(--color-accent);
}

.accordion-panel-inner {
  padding: var(--spacing-md);
  margin-top: -1px;
  border-top: 1px solid var(--color-border);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
</style>
</head>
<body>
<div id="app"></div>
:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-accent: #4f46e5;
  --color-accent-hover: #4338ca;
  --color-focus-ring: #4f46e5;
  --radius: 8px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: var(--spacing-md);
  background: var(--color-accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 0 0 var(--radius) var(--radius);
  z-index: 10000;
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 2px;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 240px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-md);
  z-index: 100;
}

.sidebar ul { list-style: none; }

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
  background: #f3f4f6;
  color: var(--color-text);
}

.nav-link:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: -2px;
}

.nav-link.active {
  background: var(--color-accent);
  color: white;
}

.main-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  min-height: calc(100vh - 240px);
}

.component-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg) var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.component-section h2 {
  font-size: 1.375rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.caption {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-lg);
  font-style: italic;
}

.widget-container {
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: #fafbfc;
  border: 1px dashed var(--color-border);
}

/* Focus styles - always visible */
button:focus-visible,
a:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 2px;
}

/* Modal styles */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-dialog {
  position: relative;
  width: 90%;
  max-width: 480px;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-dialog h3 { margin-bottom: var(--spacing-md); }

.modal-actions { display: flex; gap: var(--spacing-sm); justify-content: flex-end; margin-top: var(--spacing-lg); }

/* Dropdown styles */
.dropdown-trigger {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  font-weight: 500;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  left: 0;
  min-width: 240px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 999;
}

.dropdown-menu li { list-style: none; }

.dropdown-menu li a,
.dropdown-menu li button {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}

.dropdown-menu li:last-child { border-bottom: none; }

.dropdown-menu li:hover,
.dropdown-menu li:focus-visible {
  background: #f3f4f6;
}

/* Tabs styles */
.tablist { display: flex; gap: 0; border-bottom: 1px solid var(--color-border); margin-bottom: var(--spacing-lg); }

.tab {
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
}

.tab[aria-selected="true"] {
  color: var(--color-accent);
}

.tab[aria-selected="true"]:after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.tab:focus-visible { outline: none; }

.tab[aria-selected="true"]:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: -2px;
}

.tabpanel { display: block; padding: var(--spacing-md); }

.tabpanel[hidden] { display: none !important; }

/* Combobox styles */
.combobox-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
}

.combobox-listbox {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  left: 0;
  right: 0;
  max-height: 240px;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  z-index: 999;
}

.combobox-listbox li {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  border-bottom: 1px solid var(--color-border);
}

.combobox-listbox li:last-child { border-bottom: none; }

.combobox-listbox li:hover,
.combobox-listbox li[aria-selected="true"] {
  background: #f3f4f6;
}

/* Accordion styles */
.accordion-trigger {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion-trigger[aria-expanded="true"] {
  border-color: var(--color-accent);
}

.accordion-panel-inner {
  padding: var(--spacing-md);
  margin-top: -1px;
  border-top: 1px solid var(--color-border);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
<div id="app">
  <a href="#main" class="skip-link">Skip to main content</a>

  <aside id="sidebar" class="sidebar" aria-label="Navigation">
    <nav>
      <ul>
        <li><a href="#modal-section" class="nav-link active" data-section="modal">Modal Dialog</a></li>
        <li><a href="#dropdown-section" class="nav-link" data-section="dropdown">Dropdown Menu</a></li>
        <li><a href="#tabs-section" class="nav-link" data-section="tabs">Tabs</a></li>
        <li><a href="#combobox-section" class="nav-link" data-section="combobox">Combobox</a></li>
        <li><a href="#accordion-section" class="nav-link" data-section="accordion">Accordion</a></li>
      </ul>
    </nav>
  </aside>

  <main id="main" class="main-content">
    <!-- Modal Dialog Section -->
    <section id="modal-section" class="component-section">
      <h2>Modal Dialog</h2>
      <p class="caption">↑↓ navigate · Enter/Space select · Esc close · Click backdrop to dismiss</p>
      <div class="widget-container">
        <button id="modal-trigger" aria-haspopup="dialog" aria-label="Open modal dialog">Open Modal</button>
      </div>
    </section>

    <!-- Dropdown Menu Section -->
    <section id="dropdown-section" class="component-section">
      <h2>Dropdown Menu</h2>
      <p class="caption">Click/Enter/Space open · ↑↓ navigate · Home/End jump · Tab close · Esc close</p>
      <div class="widget-container">
        <button id="dropdown-trigger" aria-haspopup="menu" aria-expanded="false" aria-label="Open dropdown menu">Select an option...</button>
        <ul id="dropdown-menu" role="menu" aria-labelledby="dropdown-trigger"></ul>
      </div>
    </section>

    <!-- Tabs Section -->
    <section id="tabs-section" class="component-section">
      <h2>Tabs</h2>
      <p class="caption">←→ switch tabs · Enter/Space activate panel · Tab within panels</p>
      <div class="widget-container">
        <div role="tablist" aria-label="Content tabs" id="tabs-tablist">
          <button role="tab" tabindex="0" aria-selected="true" aria-controls="panel-1" id="tab-1">Overview</button>
          <button role="tab" tabindex="-1" aria-selected="false" aria-controls="panel-2" id="tab-2">Details</button>
          <button role="tab" tabindex="-1" aria-selected="false" aria-controls="panel-3" id="tab-3">Settings</button>
        </div>
        <div role="tabpanel" id="panel-1" aria-labelledby="tab-1" tabindex="0">
          <p>This is the overview panel content. It contains descriptive information about the product.</p>
        </div>
        <div role="tabpanel" id="panel-2" aria-labelledby="tab-2" tabindex="-1" hidden="">
          <p>This is the details panel content. It provides in-depth specifications and technical data.</p>
        </div>
        <div role="tabpanel" id="panel-3" aria-labelledby="tab-3" tabindex="-1" hidden="">
          <p>This is the settings panel content. Configure your preferences here to customize your experience.</p>
        </div>
      </div>
    </section>

    <!-- Combobox Section -->
    <section id="combobox-section" class="component-section">
      <h2>Combobox (Autocomplete)</h2>
      <p class="caption">Type to filter · ↑↓ navigate options · Enter/Space select · Esc close · Tab close</p>
      <div class="widget-container">
        <input id="combobox-input" type="text" role="combobox" aria-expanded="false" aria-controls="combobox-listbox" aria-activedescendant="" placeholder="Search options..." autocomplete="off">
        <ul id="combobox-listbox" role="listbox" aria-labelledby="combobox-input" hidden=""></ul>
      </div>
    </section>

    <!-- Accordion Section -->
    <section id="accordion-section" class="component-section">
      <h2>Accordion (Disclosure)</h2>
      <p class="caption">Click/Enter/Space toggle · Multiple open simultaneously</p>
      <div class="widget-container">
        <button id="acc-trigger-1" aria-expanded="false" aria-controls="acc-panel-1">What is this component?</button>
        <div id="acc-panel-1" role="region" aria-labelledby="acc-trigger-1" hidden="">
          <p>This is an accordion component that allows multiple sections to be open simultaneously. Each section can be toggled independently using keyboard navigation.</p>
        </div>

        <button id="acc-trigger-2" aria-expanded="false" aria-controls="acc-panel-2">How do I use it?</button>
        <div id="acc-panel-2" role="region" aria-labelledby="acc-trigger-2" hidden="">
          <p>Use keyboard navigation: Tab to focus a trigger, Enter or Space to toggle. Arrow keys move between triggers. All open panels remain visible and accessible.</p>
        </div>

        <button id="acc-trigger-3" aria-expanded="false" aria-controls="acc-panel-3">What's the accessibility model?</button>
        <div id="acc-panel-3" role="region" aria-labelledby="acc-trigger-3" hidden="">
          <p>This component follows WAI-ARIA Authoring Practices for Disclosure Groups. It uses aria-expanded, aria-controls, and proper heading structure to ensure screen reader compatibility.</p>
        </div>
      </div>
    </section>
  </main>
</div>
<script>
(function () {
'use strict';
var __mods = {};
var __cache = {};
var __map = {};
function __require(id) {
  if (__cache[id]) return __cache[id].exports;
  var module = __cache[id] = { exports: {} };
  var factory = __mods[id];
  if (!factory) throw new Error("Module not found: " + id);
  factory(module.exports, function (spec) {
    var target = (__map[id] && __map[id][spec]) || spec;
    return __require(target);
  }, module);
  return module.exports;
}

// ── module: src/main.ts ──
__mods["src/main.ts"] = function (exports, require, module) {
"use strict";
// Entry point. Runs after the DOM is parsed and after any classic
// <script> imports, so document queries and CDN globals are available.
// Import your other modules from here.
Object.defineProperty(exports, "__esModule", { value: true });
exports.start = start;
function start() {
    // Replace this with the real startup sequence.
}
start();
};

// ── module: src/utils.ts ──
__mods["src/utils.ts"] = function (exports, require, module) {
"use strict";
// ============================================================
// Shared utilities for accessibility components
// ============================================================
Object.defineProperty(exports, "__esModule", { value: true });
exports.RovingTabindexManager = void 0;
exports.getFocusableElements = getFocusableElements;
exports.trapFocus = trapFocus;
exports.animatePanel = animatePanel;
exports.findNearestAncestor = findNearestAncestor;
exports.isVisible = isVisible;
exports.debounce = debounce;
exports.getNextFocusable = getNextFocusable;
exports.getPrevFocusable = getPrevFocusable;
function getFocusableElements(container) {
    return Array.from(container.querySelectorAll('button, [href], input:not([disabled]):not([type="submit"]), select, textarea, [tabindex]:not([tabindex="-1"])'));
}
/**
 * Trap focus within a container. Returns true if focus is trapped (i.e., the element
 * that receives focus is inside the container).
 */
function trapFocus(container) {
    const focusable = getFocusableElements(container);
    if (focusable.length === 0)
        return false;
    const first = focusable[0];
    const last = focusable[focusable.length - 1];
    // Check if current focus is inside container
    const activeEl = document.activeElement;
    if (!container.contains(activeEl)) {
        activeEl?.focus();
        return false;
    }
    // If we're on the last element and Tab is pressed, wrap to first
    if (activeEl === last && document.event?.key === 'Tab') {
        first.focus();
        return true;
    }
    // If we're on the first element and Shift+Tab is pressed, wrap to last
    if (activeEl === first && document.event?.key === 'Tab' && !document.event?.shiftKey) {
        last.focus();
        return true;
    }
    return false;
}
/**
 * Roving tabindex manager for combobox-style lists.
 * Manages aria-activedescendant and tabindex on list items.
 */
class RovingTabindexManager {
    constructor(listbox) {
        this.activeIndex = -1;
        this.listbox = listbox;
    }
    setItems(items) {
        this.activeIndex = -1;
        items.forEach((item, i) => {
            item.setAttribute('tabindex', '-1');
            item.removeAttribute('aria-selected');
        });
        this.update();
    }
    setActive(index) {
        const items = Array.from(this.listbox.querySelectorAll('li'));
        if (index < 0 || index >= items.length)
            return;
        items.forEach((item, i) => {
            item.setAttribute('tabindex', i === index ? '0' : '-1');
            item.setAttribute('aria-selected', i === index ? 'true' : 'false');
        });
        this.activeIndex = index;
        this.update();
    }
    setActiveByText(text) {
        const items = Array.from(this.listbox.querySelectorAll('li'));
        for (let i = 0; i < items.length; i++) {
            if (items[i].textContent.toLowerCase().includes(text.toLowerCase())) {
                this.setActive(i);
                break;
            }
        }
    }
    update() {
        const listboxId = this.listbox.id;
        const activeItem = Array.from(this.listbox.querySelectorAll('li'))[this.activeIndex];
        if (activeItem) {
            document.getElementById(listboxId)?.setAttribute('aria-activedescendant', activeItem.id || '');
        }
        else {
            document.getElementById(listboxId)?.setAttribute('aria-activedescendant', '');
        }
    }
    getActiveIndex() {
        return this.activeIndex;
    }
}
exports.RovingTabindexManager = RovingTabindexManager;
/**
 * Utility to animate a panel open/closed with smooth height transition.
 * Uses requestAnimationFrame for performance and respects prefers-reduced-motion.
 */
function animatePanel(panel, isOpen) {
    const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
    if (isOpen) {
        panel.classList.add('open');
        // Ensure the element is visible after animation
        requestAnimationFrame(() => {
            panel.removeAttribute('hidden');
        });
    }
    else {
        panel.classList.remove('open');
        panel.setAttribute('hidden', '');
    }
}
/**
 * Utility to get the nearest ancestor with a specific class.
 */
function findNearestAncestor(element, className) {
    let current = element;
    while (current !== document.body) {
        if (current.classList.contains(className))
            return current;
        current = current.parentElement;
    }
    return null;
}
/**
 * Utility to check if an element is visible on screen.
 */
function isVisible(element) {
    const rect = element.getBoundingClientRect();
    return (rect.width > 0 &&
        rect.height > 0 &&
        rect.left >= -10 &&
        rect.right <= window.innerWidth + 10 &&
        rect.top >= -10 &&
        rect.bottom <= window.innerHeight + 10);
}
/**
 * Utility to debounce a function.
 */
function debounce(fn, delay) {
    let timeoutId;
    return (...args) => {
        clearTimeout(timeoutId);
        timeoutId = setTimeout(() => fn(...args), delay);
    };
}
/**
 * Utility to get the next/previous focusable element in a container.
 */
function getNextFocusable(container, current) {
    const focusable = getFocusableElements(container);
    const currentIndex = focusable.indexOf(current);
    if (currentIndex === -1)
        return null;
    const nextIndex = (currentIndex + 1) % focusable.length;
    return focusable[nextIndex];
}
function getPrevFocusable(container, current) {
    const focusable = getFocusableElements(container);
    const currentIndex = focusable.indexOf(current);
    if (currentIndex === -1)
        return null;
    const prevIndex = (currentIndex - 1 + focusable.length) % focusable.length;
    return focusable[prevIndex];
}
};

// ── entry ──
__require("src/main.ts");
})();
</script>
</body>
</html>