priors

Runs/html · chain · relay/064

html · chain · relay · step 064 of 64

Render of html · chain · relay, step 064

offline render, Chrome 154, light scheme, 2 s of virtual time

This page calls Math.random or the clock, so a live run can differ from this render.

runs in a sandboxed frame with no origin; live pages may fetch CDN fonts the offline render did not
modelHaiku 4.5 claude-haiku-4-5-20251001
effortlow
profileroom
cli version2.1.283
started2026-09-28 01:38:51 UTC
wall1m 25s
cost$0.16
turns25
output tokens8,594
thinking blocks25
tool / bash / edit calls24 / 2 / 11
denials1
file0.html
lines1,091
bytes33,079
what changed
  • added color
  • shadow or glow
  • animation
  • script
features
  • shadow or glow
  • animation
  • script
  • calls Math.random or the clock
hex colors
  • #ffffff
  • #121212
  • #1a1a1a
  • #555555
  • #f9f9f9
  • #0052a3
  • #e0e0e0
  • #767676
  • #c62828
  • #1b5e20
  • #a0a0a0
  • #1e1e1e
  • #5fa3ff
  • #333333
  • #8c8c8c
  • #ff8a80
  • #66bb6a
  • #000000
  • #999999
unchangedno
from seedno
session116e4292-7490-40db-911c-939f72e73673
0.html 1,091 lines · 33,079 bytes
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
	<meta charset="utf-8">
	<meta http-equiv="content-security-policy" content="default-src 'none'; script-src 'unsafe-inline'; style-src 'unsafe-inline'; img-src data:; base-uri 'none'; form-action 'none'">
	<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
	<meta name="description" content="A well-structured, accessible HTML5 document demonstrating modern best practices for semantic markup and inclusive design.">
	<meta name="author" content="K. Smith">
	<meta name="color-scheme" content="light dark">
	<meta name="theme-color" content="#ffffff" media="(prefers-color-scheme: light)">
	<meta name="theme-color" content="#121212" media="(prefers-color-scheme: dark)">
	<meta property="og:title" content="Welcome - Accessible HTML5 Guide">
	<meta property="og:description" content="Modern HTML5 demonstrating accessibility, semantic markup, and responsive design.">
	<meta property="og:type" content="website">
	<meta property="og:url" content="https://www.example.com">
	<meta name="twitter:card" content="summary">
	<meta name="twitter:title" content="Welcome - Accessible HTML5 Guide">
	<meta name="twitter:description" content="Modern HTML5 demonstrating accessibility, semantic markup, and responsive design.">
	<title>Welcome - Accessible HTML5 Guide</title>
	<script type="application/ld+json">
	{
		"@context": "https://schema.org",
		"@type": "WebPage",
		"name": "Accessible HTML5 Guide",
		"description": "A well-structured, accessible HTML5 document demonstrating modern best practices for semantic markup and inclusive design.",
		"author": {
			"@type": "Person",
			"name": "K. Smith"
		}
	}
	</script>
	<script>
		try {
			const storedTheme = localStorage.getItem('theme');
			if (storedTheme === 'light' || storedTheme === 'dark') {
				document.documentElement.dataset.theme = storedTheme;
			}
		} catch {}
	</script>
	<link rel="icon" type="image/svg+xml" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ctext y='.9em' font-size='90'%3E👋%3C/text%3E%3C/svg%3E">
	<link rel="canonical" href="https://www.example.com">
	<link rel="dns-prefetch" href="https://www.w3.org">
	<link rel="dns-prefetch" href="https://html.spec.whatwg.org">
	<link rel="dns-prefetch" href="https://www.a11y-101.com">
	<link rel="dns-prefetch" href="https://developer.mozilla.org">
	<style>
		:root {
			color-scheme: light dark;
			--text: #1a1a1a;
			--text-secondary: #555;
			--background: #fff;
			--surface: #f9f9f9;
			--accent: #0052a3;
			--border: #e0e0e0;
			--border-control: #767676;
			--error: #c62828;
			--success: #1b5e20;
		}
		@media screen and (prefers-color-scheme: dark) {
			:root:not([data-theme="light"]) {
				--text: #e0e0e0;
				--text-secondary: #a0a0a0;
				--background: #121212;
				--surface: #1e1e1e;
				--accent: #5fa3ff;
				--border: #333;
				--border-control: #8c8c8c;
				--error: #ff8a80;
				--success: #66bb6a;
			}
		}
		@media screen {
			:root[data-theme="light"] {
				color-scheme: light;
			}
			:root[data-theme="dark"] {
				color-scheme: dark;
				--text: #e0e0e0;
				--text-secondary: #a0a0a0;
				--background: #121212;
				--surface: #1e1e1e;
				--accent: #5fa3ff;
				--border: #333;
				--border-control: #8c8c8c;
				--error: #ff8a80;
				--success: #66bb6a;
			}
		}
		[hidden] {
			display: none !important;
		}
		*,
		*::before,
		*::after {
			box-sizing: border-box;
		}
		html {
			-webkit-text-size-adjust: 100%;
			text-size-adjust: 100%;
		}
		@media (prefers-reduced-motion: no-preference) {
			html {
				scroll-behavior: smooth;
			}
			a {
				transition: text-decoration-thickness 0.15s ease;
			}
			.skip-link {
				transition: transform 0.15s ease;
			}
			button,
			.button {
				transition: filter 0.15s ease, transform 0.15s ease;
			}
			input,
			textarea {
				transition: border-color 0.15s ease, box-shadow 0.15s ease;
			}
		}
		body {
			display: grid;
			grid-template-columns: minmax(0, 1fr);
			grid-template-rows: auto 1fr auto;
			min-height: 100vh;
			min-height: 100dvh;
			font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
			font-size: 1rem;
			line-height: 1.6;
			overflow-wrap: break-word;
			max-width: 70ch;
			margin: 0 auto;
			padding-top: max(clamp(1rem, 5vw, 1.5rem), env(safe-area-inset-top));
			padding-right: max(clamp(1rem, 5vw, 1.5rem), env(safe-area-inset-right));
			padding-bottom: max(clamp(1rem, 5vw, 1.5rem), env(safe-area-inset-bottom));
			padding-left: max(clamp(1rem, 5vw, 1.5rem), env(safe-area-inset-left));
			color: var(--text);
			background: var(--background);
		}
		h1 {
			color: var(--accent);
			font-size: clamp(1.75rem, 1.25rem + 3vw, 2.5rem);
			font-weight: 700;
			line-height: 1.1;
			text-wrap: balance;
			margin: 0 0 1.5rem 0;
			letter-spacing: -0.02em;
		}
		h2 {
			color: var(--accent);
			font-size: clamp(1.25rem, 1rem + 1.5vw, 1.75rem);
			font-weight: 600;
			line-height: 1.2;
			text-wrap: balance;
			margin: 2rem 0 1rem 0;
			letter-spacing: -0.01em;
		}
		h2:first-child {
			margin-top: 0;
		}
		p {
			text-wrap: pretty;
			margin: 1rem 0;
			line-height: 1.65;
		}
		a {
			color: var(--accent);
			text-underline-offset: 0.2em;
			text-decoration-thickness: 2px;
			text-decoration-skip-ink: auto;
			font-weight: 500;
		}
		a:active {
			text-decoration-thickness: 3px;
		}
		@media (hover: hover) {
			a:hover {
				text-decoration-thickness: 3px;
			}
		}
		a[target="_blank"]::after {
			content: "\2197";
			content: "\2197" / "";
			display: inline-block;
			margin-inline-start: 0.2em;
			font-size: 0.8em;
			text-decoration: none;
		}
		button,
		.button {
			display: inline-block;
			text-decoration: none;
			padding: 0.75rem 1.5rem;
			font-size: 1rem;
			font-weight: 500;
			font-family: inherit;
			color: var(--background);
			background: var(--accent);
			border: 2px solid var(--accent);
			border-radius: 0.25rem;
			cursor: pointer;
			white-space: nowrap;
			user-select: none;
		}
		@media (hover: hover) {
			button:not(:disabled, [aria-disabled="true"]):hover,
			.button:hover {
				filter: brightness(1.15);
			}
		}
		button:not(:disabled, [aria-disabled="true"]):active,
		.button:active {
			transform: scale(0.97);
		}
		button:disabled,
		button[aria-disabled="true"] {
			opacity: 0.6;
			cursor: not-allowed;
		}
		ul, ol {
			margin: 1rem 0;
			padding-inline-start: 2rem;
		}
		li {
			margin: 0.5rem 0;
		}
		:focus-visible {
			outline: 3px solid var(--accent);
			outline-offset: 2px;
		}
		a:not(.button):focus-visible {
			border-radius: 2px;
		}
		.skip-link {
			position: absolute;
			inset-inline-start: 0;
			top: 0;
			transform: translateY(-100%);
			background: var(--accent);
			color: var(--background);
			padding: 0.75rem 1.5rem;
			z-index: 1000;
			border-end-end-radius: 0.25rem;
			font-weight: 600;
			text-decoration: none;
			display: inline-block;
		}
		.skip-link:focus {
			transform: translateY(0);
			outline: 3px solid var(--text);
			outline-offset: -3px;
			box-shadow: inset 0 0 0 2px var(--background);
		}
		header {
			padding-block: 1.5rem 0;
		}
		.header-bar {
			display: flex;
			justify-content: space-between;
			align-items: center;
			gap: 1rem;
			margin-bottom: 1rem;
		}
		.header-bar h1 {
			margin: 0;
		}
		.theme-toggle {
			display: flex;
			align-items: center;
			justify-content: center;
			flex-shrink: 0;
			width: 2.75rem;
			height: 2.75rem;
			padding: 0;
			font-size: 1.25rem;
			color: var(--text);
			background: var(--surface);
			border: 1px solid var(--border-control);
		}
		nav ul {
			display: flex;
			flex-wrap: wrap;
			gap: 0.5rem 1.5rem;
			margin: 1rem 0 0 0;
			padding: 0;
			list-style: none;
		}
		nav li {
			margin: 0;
		}
		footer nav ul {
			justify-content: center;
			margin: 0 0 1rem 0;
		}
		main {
			padding: 1rem 0;
		}
		main:focus {
			outline: none;
		}
		section {
			margin: 2rem 0;
		}
		[id] {
			scroll-margin-top: 1.5rem;
		}
		@media (forced-colors: active) {
			.skip-link,
			button,
			.button {
				border: 2px solid ButtonText;
			}
			/* System colors override the page theme, so the toggle would do nothing. */
			.theme-toggle {
				display: none;
			}
		}
		.card {
			border: 1px solid var(--border);
			border-radius: 0.5rem;
			padding: 1.5rem;
			background: var(--surface);
			margin: 1.5rem 0;
			box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
		}
		.card h3 {
			font-size: 1.25rem;
			line-height: 1.3;
			text-wrap: balance;
			margin-top: 0;
			margin-bottom: 0.5rem;
			color: var(--accent);
		}
		table {
			width: 100%;
			margin: 1rem 0;
			border-collapse: collapse;
		}
		caption {
			margin-bottom: 0.5rem;
			font-weight: 500;
			text-align: start;
		}
		th,
		td {
			padding: 0.75rem;
			text-align: center;
			border-bottom: 1px solid var(--border);
		}
		th:first-child {
			text-align: start;
		}
		thead th {
			border-bottom-width: 2px;
			font-weight: 700;
			background: var(--surface);
		}
		tbody tr:last-child > * {
			border-bottom: none;
		}
		.visually-hidden {
			position: absolute;
			width: 1px;
			height: 1px;
			margin: -1px;
			padding: 0;
			overflow: hidden;
			clip: rect(0, 0, 0, 0);
			clip-path: inset(50%);
			white-space: nowrap;
			border: 0;
		}
		@media (prefers-contrast: more) {
			/* Doubled to outrank the dark theme selectors, which would otherwise reset these borders. */
			:root:root {
				--border: currentColor;
				--border-control: currentColor;
			}
			button,
			.button {
				border-width: 3px;
			}
			.card {
				border-width: 2px;
			}
		}
		footer {
			padding-block: 1.5rem;
			border-top: 1px solid var(--border);
			font-size: 0.875rem;
			color: var(--text-secondary);
			text-align: center;
		}
		footer p {
			margin: 0.5rem 0;
		}
		small {
			display: block;
		}
		kbd {
			background: var(--surface);
			border: 1px solid var(--border);
			border-radius: 0.25rem;
			padding: 0.125rem 0.375rem;
			font-family: monospace;
			font-size: 0.875em;
		}
		pre {
			overflow-x: auto;
			background: var(--surface);
			border: 1px solid var(--border);
			border-radius: 0.5rem;
			padding: 1rem;
			margin: 1rem 0;
		}
		code {
			font-family: 'Courier New', Courier, monospace;
			font-size: 0.875em;
		}
		pre code {
			background: none;
			padding: 0;
		}
		fieldset {
			border: none;
			padding: 0;
			margin: 0 0 1rem 0;
		}
		legend {
			display: block;
			padding: 0;
			font-weight: 600;
			margin-bottom: 1rem;
		}
		.field {
			margin-bottom: 1rem;
		}
		label {
			display: block;
			margin-bottom: 0.5rem;
			font-weight: 500;
		}
		input,
		textarea {
			width: 100%;
			padding: 0.5rem;
			font: inherit;
			color: var(--text);
			background: var(--surface);
			border: 1px solid var(--border-control);
			border-radius: 0.25rem;
		}
		textarea {
			resize: vertical;
		}
		#form-status {
			margin: 0;
		}
		#form-status:not(:empty) {
			margin-top: 1rem;
			padding: 0.75rem 1rem;
			border-radius: 0.25rem;
			background: var(--surface);
			background: color-mix(in srgb, var(--success) 10%, transparent);
			color: var(--success);
			border: 2px solid var(--success);
			animation: slideDown 0.3s ease;
			font-weight: 500;
		}
		#form-status[data-state="pending"] {
			background: var(--background);
			color: var(--text-secondary);
			border-color: var(--border-control);
		}
		@keyframes slideDown {
			from {
				opacity: 0;
				transform: translateY(-0.5rem);
			}
			to {
				opacity: 1;
				transform: translateY(0);
			}
		}
		@media (prefers-reduced-motion: reduce) {
			#form-status:not(:empty) {
				animation: none;
			}
		}
		#form-status[data-state="error"] {
			background: color-mix(in srgb, var(--error) 10%, transparent);
			color: var(--error);
			border-color: var(--error);
			border-width: 2px;
			font-weight: 500;
		}
		.form-hint {
			margin: 0 0 1rem 0;
			font-size: 0.875rem;
			color: var(--text-secondary);
		}
		.field .form-hint {
			margin: 0.25rem 0 0 0;
		}
		.error-message {
			display: block;
			color: var(--error);
			font-size: 0.875rem;
			font-weight: 500;
		}
		.error-message:not(:empty) {
			margin-top: 0.25rem;
		}
		.counter {
			display: flex;
			flex-wrap: wrap;
			gap: 1rem;
			align-items: center;
			margin: 1.5rem 0;
		}
		.counter output {
			min-width: 4ch;
			font-size: 1.75rem;
			font-weight: 700;
			font-variant-numeric: tabular-nums;
			color: var(--accent);
			text-align: center;
			padding: 0.5rem;
			background: var(--surface);
			border-radius: 0.25rem;
			border: 2px solid var(--border);
		}
		.counter #reset {
			margin-inline-start: auto;
		}
		.live-region {
			display: flex;
			align-items: center;
			min-height: 3.5rem;
			margin-top: 1rem;
			padding: 1rem;
			border: 2px dashed var(--border);
			border-radius: 0.25rem;
			background: var(--surface);
			font-style: italic;
			color: var(--text-secondary);
		}
		input:focus,
		textarea:focus {
			outline: 2px solid var(--accent);
			outline-offset: 2px;
			border-color: var(--accent);
			background: var(--background);
		}
		/* After :focus so the error state stays visible while the field is being corrected. */
		:is(input, textarea)[aria-invalid="true"] {
			border-color: var(--error);
			box-shadow: inset 0 0 0 1px var(--error);
		}
		@media print {
			:root {
				color-scheme: light;
				--text: #000;
				--text-secondary: #333;
				--background: #fff;
				--surface: #fff;
				--accent: #000;
				--border: #999;
				--border-control: #000;
				--error: #000;
				--success: #000;
			}
			pre {
				border: 1px solid #000;
				page-break-inside: avoid;
			}
			.skip-link,
			nav,
			button,
			.button,
			.live-region {
				display: none;
			}
			body {
				display: block;
				min-height: 0;
				max-width: none;
				padding: 0;
			}
			a {
				color: inherit;
				text-decoration: underline;
			}
			a[href^="http"]::after {
				content: " (" attr(href) ")";
				display: inline;
				margin: 0;
				font-size: 0.85em;
				font-weight: normal;
			}
			.card {
				border: none;
				break-inside: avoid;
			}
		}
	</style>
	<noscript>
		<style>
			.theme-toggle, #announce, #decrease, #increase, #reset, .live-region { display: none; }
			.noscript-notice {
				margin: 0 0 1.5rem 0;
				padding: 1rem;
				border: 1px solid var(--border);
				border-radius: 0.25rem;
				background: var(--surface);
				color: var(--text-secondary);
			}
		</style>
	</noscript>
</head>
<body>
	<a class="skip-link" href="#main">Skip to content</a>
	<header id="top">
		<noscript>
			<p class="noscript-notice">This page works best with JavaScript enabled. Without it, theme switching, the contact form, and the live announcement demos are unavailable.</p>
		</noscript>
		<div class="header-bar">
			<h1>Accessible HTML5 Guide</h1>
			<button id="theme-toggle" class="theme-toggle" type="button" aria-label="Switch to dark mode" title="Switch to dark mode" hidden>🌙</button>
		</div>
		<nav aria-label="Page sections">
			<ul>
				<li><a href="#welcome" aria-current="page">Welcome</a></li>
				<li><a href="#features">Features</a></li>
				<li><a href="#examples">Examples</a></li>
				<li><a href="#accessibility">Accessibility</a></li>
				<li><a href="#code-examples">Code</a></li>
				<li><a href="#resources">Resources</a></li>
			</ul>
		</nav>
	</header>
	<main id="main" tabindex="-1">
		<section aria-labelledby="welcome">
			<h2 id="welcome">Welcome to Accessible HTML5</h2>
			<p>This is a well-structured, accessible HTML5 document demonstrating modern best practices for semantic markup and inclusive design.</p>
			<p>
				It uses semantic landmarks, a skip link for keyboard navigation,
				and CSS that adapts to your light or dark mode preference.
			</p>
			<p>
				Text and link colors meet WCAG AA contrast in both themes, type scales
				with your browser's font size, and motion respects your system settings.
			</p>
		</section>

		<section aria-labelledby="features">
			<h2 id="features">Features</h2>
			<ul>
				<li>Semantic HTML structure with proper landmarks</li>
				<li>Keyboard accessible navigation and focus management</li>
				<li>Dark mode support with custom color schemes</li>
				<li>Responsive typography using modern CSS</li>
				<li>Print-friendly styles for better readability</li>
				<li>WCAG AA contrast compliance in all color modes</li>
			</ul>
		</section>

		<section aria-labelledby="examples">
			<h2 id="examples">Examples</h2>
			<article class="card">
				<h3>Component Cards</h3>
				<p>Card components are useful for organizing related content. They include a subtle border and padding for visual separation.</p>
				<a class="button" href="#resources">Learn more<span class="visually-hidden"> about accessibility resources</span></a>
			</article>

			<article class="card">
				<h3>Interactive Elements</h3>
				<p>Buttons and links are fully accessible with clear focus states. All interactive elements include visible focus indicators and proper ARIA labels.</p>
				<p><strong>Keyboard navigation:</strong> Use <kbd>Tab</kbd> to move forward, <kbd>Shift</kbd>+<kbd>Tab</kbd> to move backward, and <kbd>Enter</kbd> or <kbd>Space</kbd> to activate.</p>
			</article>

			<article class="card">
				<h3>Accessible Form</h3>
				<form id="contact-form">
					<fieldset>
						<legend>Contact Information</legend>
						<div class="field">
							<label for="name">Name</label>
							<input type="text" id="name" name="name" autocomplete="name" spellcheck="true" required aria-describedby="name-help">
							<small id="name-help" class="form-hint">Your full name</small>
						</div>
						<div class="field">
							<label for="email">Email <span class="form-hint" aria-hidden="true">(required)</span></label>
							<input type="email" id="email" name="email" autocomplete="email" inputmode="email" spellcheck="false" autocapitalize="none" required aria-describedby="email-help">
							<span id="email-error" class="error-message" aria-live="polite"></span>
							<small id="email-help" class="form-hint">For example, name@example.com</small>
						</div>
						<div class="field">
							<label for="phone">Phone <span class="form-hint" aria-hidden="true">(optional)</span></label>
							<input type="tel" id="phone" name="phone" autocomplete="tel" inputmode="tel" aria-describedby="phone-help">
							<small id="phone-help" class="form-hint">Format: (123) 456-7890 or +1-234-567-8900</small>
						</div>
						<div class="field">
							<label for="message">Message</label>
							<textarea id="message" name="message" rows="4" maxlength="2000" aria-describedby="message-help"></textarea>
							<small id="message-help" class="form-hint">Up to 2,000 characters. <span id="message-count">2,000</span> remaining.</small>
							<span id="message-count-status" class="visually-hidden" role="status"></span>
						</div>
					</fieldset>
					<button type="submit">Send message</button>
					<p id="form-status" role="status"></p>
				</form>
			</article>

			<article class="card">
				<h3>Live Region Example</h3>
				<p>Click the button to announce a message using a live region. This demonstrates how screen readers are notified of dynamic updates.</p>
				<button id="announce" type="button">Announce message</button>
				<div class="live-region" aria-live="polite" aria-atomic="true">
					<span id="live-message"></span>
				</div>
			</article>

			<article class="card">
				<h3>Interactive Counter</h3>
				<p>This counter demonstrates state management and ARIA live regions for accessible dynamic content. Screen readers announce each change once, from the message below the controls.</p>
				<div class="counter">
					<button id="decrease" type="button" aria-label="Decrease count">−</button>
					<output id="count" for="decrease increase reset" aria-live="off">0</output>
					<button id="increase" type="button" aria-label="Increase count">+</button>
					<button id="reset" type="button" aria-label="Reset count">Reset</button>
				</div>
				<div class="live-region" aria-live="polite" aria-atomic="true">
					<span id="count-message"></span>
				</div>
			</article>
		</section>

		<section aria-labelledby="accessibility">
			<h2 id="accessibility">Accessibility Features</h2>
			<article class="card">
				<h3>Data Table Example</h3>
				<p>Accessible tables have proper headers, captions, and semantic structure for screen readers.</p>
				<table>
					<caption>Browser compatibility for modern features</caption>
					<thead>
						<tr>
							<th scope="col">Feature</th>
							<th scope="col">Chrome</th>
							<th scope="col">Firefox</th>
							<th scope="col">Safari</th>
						</tr>
					</thead>
					<tbody>
						<tr>
							<th scope="row">CSS Grid</th>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
						</tr>
						<tr>
							<th scope="row">CSS Variables</th>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
						</tr>
						<tr>
							<th scope="row">Aspect Ratio</th>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
							<td><span aria-hidden="true">✓</span><span class="visually-hidden">Supported</span></td>
						</tr>
					</tbody>
				</table>
			</article>
		</section>

		<section aria-labelledby="code-examples">
			<h2 id="code-examples">Code Examples</h2>
			<article class="card">
				<h3>Semantic HTML Structure</h3>
				<p>Use semantic elements to give your HTML meaning. Screen readers and assistive technologies rely on proper element usage.</p>
				<pre><code>&lt;header&gt;
  &lt;nav aria-label="Main navigation"&gt;
    &lt;ul&gt;
      &lt;li&gt;&lt;a href="/"&gt;Home&lt;/a&gt;&lt;/li&gt;
      &lt;li&gt;&lt;a href="/about"&gt;About&lt;/a&gt;&lt;/li&gt;
    &lt;/ul&gt;
  &lt;/nav&gt;
&lt;/header&gt;
&lt;main id="main"&gt;
  &lt;article&gt;
    &lt;h1&gt;Article Title&lt;/h1&gt;
    &lt;p&gt;Article content...&lt;/p&gt;
  &lt;/article&gt;
&lt;/main&gt;
&lt;footer&gt;
  &lt;p&gt;&amp;copy; 2026 Your Name&lt;/p&gt;
&lt;/footer&gt;</code></pre>
			</article>
			<article class="card">
				<h3>ARIA Labels and Descriptions</h3>
				<p>Use ARIA attributes to provide additional context when semantic HTML alone isn't enough.</p>
				<pre><code>&lt;!-- Label a button with aria-label --&gt;
&lt;button aria-label="Close dialog"&gt;×&lt;/button&gt;

&lt;!-- Describe an input with aria-describedby --&gt;
&lt;input type="password" aria-describedby="pwd-hint"&gt;
&lt;small id="pwd-hint"&gt;8+ characters, with uppercase and numbers&lt;/small&gt;

&lt;!-- Use aria-live for dynamic updates --&gt;
&lt;div aria-live="polite" aria-atomic="true"&gt;
  &lt;span id="status"&gt;&lt;/span&gt;
&lt;/div&gt;</code></pre>
			</article>
			<article class="card">
				<h3>Focus Management</h3>
				<p>Ensure focus is always visible and moves logically through the page using keyboard navigation.</p>
				<pre><code>/* Always show focus outlines */
:focus-visible {
  outline: 3px solid #0052a3;
  outline-offset: 2px;
}

/* Skip link for keyboard users */
.skip-link:focus {
  transform: translateY(0);
  position: relative;
  z-index: 1000;
}</code></pre>
			</article>
		</section>

		<section aria-labelledby="resources">
			<h2 id="resources">Resources</h2>
			<p>Want to learn more about web accessibility and semantic HTML? Check out these resources:</p>
			<ul>
				<li><a href="https://www.w3.org/WAI/WCAG22/quickref/" target="_blank" rel="noopener noreferrer">WCAG 2.2 Quick Reference<span class="visually-hidden"> (opens in new tab)</span></a></li>
				<li><a href="https://html.spec.whatwg.org/" target="_blank" rel="noopener noreferrer">HTML Living Standard<span class="visually-hidden"> (opens in new tab)</span></a></li>
				<li><a href="https://www.a11y-101.com/" target="_blank" rel="noopener noreferrer">A11y 101<span class="visually-hidden"> (opens in new tab)</span></a></li>
				<li><a href="https://developer.mozilla.org/en-US/docs/Web/Accessibility" target="_blank" rel="noopener noreferrer">MDN Web Accessibility<span class="visually-hidden"> (opens in new tab)</span></a></li>
			</ul>
		</section>
	</main>
	<footer>
		<nav aria-label="Footer links">
			<ul>
				<li><a href="#top">Back to top</a></li>
				<li><a href="https://github.com" target="_blank" rel="noopener noreferrer">GitHub<span class="visually-hidden"> (opens in new tab)</span></a></li>
			</ul>
		</nav>
		<p><small>&copy; <span id="copyright-year">2026</span> K. Smith. All rights reserved.</small></p>
	</footer>
	<script>
		const themeToggle = document.getElementById('theme-toggle');
		const htmlElement = document.documentElement;
		const prefersDark = window.matchMedia('(prefers-color-scheme: dark)');

		const themeColors = { light: '#ffffff', dark: '#121212' };
		const themeColorMetas = document.querySelectorAll('meta[name="theme-color"]');
		themeColorMetas.forEach((meta) => {
			meta.dataset.defaultContent = meta.content;
		});

		const updateThemeUI = () => {
			const forced = htmlElement.dataset.theme;
			const isDark = forced ? forced === 'dark' : prefersDark.matches;
			const label = isDark ? 'Switch to light mode' : 'Switch to dark mode';
			themeToggle.textContent = isDark ? '☀️' : '🌙';
			themeToggle.setAttribute('aria-label', label);
			themeToggle.title = label;
			themeColorMetas.forEach((meta) => {
				meta.content = forced ? themeColors[forced] : meta.dataset.defaultContent;
			});
		};

		if (themeToggle) {
			themeToggle.hidden = false;
			updateThemeUI();

			themeToggle.addEventListener('click', () => {
				const systemTheme = prefersDark.matches ? 'dark' : 'light';
				const current = htmlElement.dataset.theme || systemTheme;
				const next = current === 'dark' ? 'light' : 'dark';
				// Choosing the system theme clears the override so the page follows the OS again.
				try {
					if (next === systemTheme) {
						delete htmlElement.dataset.theme;
						localStorage.removeItem('theme');
					} else {
						htmlElement.dataset.theme = next;
						localStorage.setItem('theme', next);
					}
				} catch {}
				updateThemeUI();
			});

			prefersDark.addEventListener('change', () => {
				if (!htmlElement.dataset.theme) {
					updateThemeUI();
				}
			});

			// Keep other open tabs in step with the choice made in this one.
			window.addEventListener('storage', (event) => {
				if (event.key !== null && event.key !== 'theme') {
					return;
				}
				if (event.newValue === 'light' || event.newValue === 'dark') {
					htmlElement.dataset.theme = event.newValue;
				} else {
					delete htmlElement.dataset.theme;
				}
				updateThemeUI();
			});
		}

		const copyrightYear = document.getElementById('copyright-year');
		if (copyrightYear) {
			copyrightYear.textContent = String(new Date().getFullYear());
		}

		const messages = [
			"This update was announced to screen readers!",
			"Dynamic content updates work with aria-live regions.",
			"Live regions are essential for accessible web apps.",
			"Try this with a screen reader like NVDA or JAWS!"
		];
		let nextMessage = 0;
		let count = 0;
		const announceBtn = document.getElementById('announce');
		const liveMessage = document.getElementById('live-message');
		const contactForm = document.getElementById('contact-form');
		const emailInput = document.getElementById('email');
		const messageInput = document.getElementById('message');
		const messageCount = document.getElementById('message-count');
		const messageCountStatus = document.getElementById('message-count-status');
		const formStatus = document.getElementById('form-status');
		const countDisplay = document.getElementById('count');
		const countMessage = document.getElementById('count-message');
		const decreaseBtn = document.getElementById('decrease');
		const increaseBtn = document.getElementById('increase');
		const resetBtn = document.getElementById('reset');

		const updateCountDisplay = () => {
			countDisplay.textContent = String(count);
			countMessage.textContent = `Count is ${count}.`;
		};

		if (countDisplay && countMessage) {
			decreaseBtn?.addEventListener('click', () => {
				count--;
				updateCountDisplay();
			});

			increaseBtn?.addEventListener('click', () => {
				count++;
				updateCountDisplay();
			});

			resetBtn?.addEventListener('click', () => {
				count = 0;
				updateCountDisplay();
			});
		}

		if (announceBtn && liveMessage) {
			announceBtn.addEventListener('click', () => {
				liveMessage.textContent = messages[nextMessage];
				nextMessage = (nextMessage + 1) % messages.length;
			});
		}

		if (contactForm) {
			const emailError = document.getElementById('email-error');
			const nameInput = document.getElementById('name');
			const submitBtn = contactForm.querySelector('button[type="submit"]');
			const isSending = () => submitBtn.getAttribute('aria-disabled') === 'true';

			// Set here rather than in the markup so native validation still works without JavaScript.
			contactForm.noValidate = true;

			const setFormStatus = (message, state) => {
				formStatus.textContent = message;
				if (state) {
					formStatus.dataset.state = state;
				} else {
					delete formStatus.dataset.state;
				}
			};

			const countThresholds = [0, 10, 25, 50, 100];
			let lastThreshold;

			const updateMessageCount = () => {
				if (messageInput && messageCount) {
					const remaining = messageInput.maxLength - messageInput.value.length;
					// Match the page language rather than the browser locale.
					messageCount.textContent = remaining.toLocaleString(htmlElement.lang);
					// Announce only when a threshold is crossed, not on every keystroke.
					const threshold = countThresholds.find((limit) => remaining <= limit);
					if (messageCountStatus && threshold !== lastThreshold) {
						lastThreshold = threshold;
						messageCountStatus.textContent = threshold === undefined
							? ''
							: `${remaining.toLocaleString(htmlElement.lang)} characters remaining.`;
					}
				}
			};

			messageInput?.addEventListener('input', updateMessageCount);
			// Browsers may restore field values on back/forward navigation.
			window.addEventListener('pageshow', updateMessageCount);
			updateMessageCount();

			const setEmailError = (message) => {
				emailError.textContent = message;
				if (message) {
					emailInput.setAttribute('aria-invalid', 'true');
					emailInput.setAttribute('aria-describedby', 'email-error email-help');
				} else {
					emailInput.removeAttribute('aria-invalid');
					emailInput.setAttribute('aria-describedby', 'email-help');
				}
			};

			const validateEmail = () => {
				let message = '';
				if (emailInput.validity.valueMissing) {
					message = 'Email address is required for us to respond.';
				} else if (emailInput.validity.typeMismatch) {
					message = 'Please enter a valid email address, such as name@example.com.';
				} else if (!emailInput.validity.valid) {
					message = 'Please enter a valid email address.';
				}
				setEmailError(message);
				return !message;
			};

			emailInput.addEventListener('blur', () => {
				if (emailInput.value || emailInput.hasAttribute('aria-invalid')) {
					validateEmail();
				}
			});

			emailInput.addEventListener('input', () => {
				if (emailInput.hasAttribute('aria-invalid')) {
					validateEmail();
				}
			});

			contactForm.addEventListener('input', () => {
				if (!isSending()) {
					setFormStatus('');
				}
			});

			contactForm.addEventListener('submit', async (event) => {
				event.preventDefault();
				if (isSending()) {
					return;
				}
				setFormStatus('');
				if (!validateEmail()) {
					setFormStatus('Please correct the errors above before submitting.', 'error');
					emailInput.focus();
					return;
				}
				const originalText = submitBtn.textContent;
				submitBtn.setAttribute('aria-disabled', 'true');
				submitBtn.setAttribute('aria-busy', 'true');
				submitBtn.textContent = 'Sending…';
				setFormStatus('Sending your message…', 'pending');
				if (nameInput) nameInput.readOnly = true;
				emailInput.readOnly = true;
				if (messageInput) messageInput.readOnly = true;
				await new Promise(resolve => setTimeout(resolve, 800));
				emailInput.readOnly = false;
				if (messageInput) messageInput.readOnly = false;
				if (nameInput) nameInput.readOnly = false;
				contactForm.reset();
				setEmailError('');
				updateMessageCount();
				submitBtn.removeAttribute('aria-disabled');
				submitBtn.removeAttribute('aria-busy');
				submitBtn.textContent = originalText;
				setFormStatus('Success! Thanks for your message. This is a demo, so nothing was sent.');
			});
		}
	</script>
</body>
</html>
what changed from step 063

+95 / -0 lines

  	<link rel="icon" type="image/svg+xml" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ctext y='.9em' font-size='90'%3E👋%3C/text%3E%3C/svg%3E">  	<link rel="canonical" href="https://www.example.com">+ 	<link rel="dns-prefetch" href="https://www.w3.org">+ 	<link rel="dns-prefetch" href="https://html.spec.whatwg.org">+ 	<link rel="dns-prefetch" href="https://www.a11y-101.com">+ 	<link rel="dns-prefetch" href="https://developer.mozilla.org">  	<style>  		:root {⋯ line 405  			font-size: 0.875em;  		}+ 		pre {+ 			overflow-x: auto;+ 			background: var(--surface);+ 			border: 1px solid var(--border);+ 			border-radius: 0.5rem;+ 			padding: 1rem;+ 			margin: 1rem 0;+ 		}+ 		code {+ 			font-family: 'Courier New', Courier, monospace;+ 			font-size: 0.875em;+ 		}+ 		pre code {+ 			background: none;+ 			padding: 0;+ 		}  		fieldset {  			border: none;⋯ line 570  				--success: #000;  			}+ 			pre {+ 				border: 1px solid #000;+ 				page-break-inside: avoid;+ 			}  			.skip-link,  			nav,⋯ line 630  		<nav aria-label="Page sections">  			<ul>+ 				<li><a href="#welcome" aria-current="page">Welcome</a></li>  				<li><a href="#features">Features</a></li>  				<li><a href="#examples">Examples</a></li>  				<li><a href="#accessibility">Accessibility</a></li>+ 				<li><a href="#code-examples">Code</a></li>  				<li><a href="#resources">Resources</a></li>  			</ul>⋯ line 685  						<legend>Contact Information</legend>  						<div class="field">+ 							<label for="name">Name</label>+ 							<input type="text" id="name" name="name" autocomplete="name" spellcheck="true" required aria-describedby="name-help">+ 							<small id="name-help" class="form-hint">Your full name</small>+ 						</div>+ 						<div class="field">  							<label for="email">Email <span class="form-hint" aria-hidden="true">(required)</span></label>  							<input type="email" id="email" name="email" autocomplete="email" inputmode="email" spellcheck="false" autocapitalize="none" required aria-describedby="email-help">⋯ line 696  						</div>  						<div class="field">+ 							<label for="phone">Phone <span class="form-hint" aria-hidden="true">(optional)</span></label>+ 							<input type="tel" id="phone" name="phone" autocomplete="tel" inputmode="tel" aria-describedby="phone-help">+ 							<small id="phone-help" class="form-hint">Format: (123) 456-7890 or +1-234-567-8900</small>+ 						</div>+ 						<div class="field">  							<label for="message">Message</label>  							<textarea id="message" name="message" rows="4" maxlength="2000" aria-describedby="message-help"></textarea>⋯ line 775  		</section>  + 		<section aria-labelledby="code-examples">+ 			<h2 id="code-examples">Code Examples</h2>+ 			<article class="card">+ 				<h3>Semantic HTML Structure</h3>+ 				<p>Use semantic elements to give your HTML meaning. Screen readers and assistive technologies rely on proper element usage.</p>+ 				<pre><code>&lt;header&gt;+   &lt;nav aria-label="Main navigation"&gt;+     &lt;ul&gt;+       &lt;li&gt;&lt;a href="/"&gt;Home&lt;/a&gt;&lt;/li&gt;+       &lt;li&gt;&lt;a href="/about"&gt;About&lt;/a&gt;&lt;/li&gt;+     &lt;/ul&gt;+   &lt;/nav&gt;+ &lt;/header&gt;+ &lt;main id="main"&gt;+   &lt;article&gt;+     &lt;h1&gt;Article Title&lt;/h1&gt;+     &lt;p&gt;Article content...&lt;/p&gt;+   &lt;/article&gt;+ &lt;/main&gt;+ &lt;footer&gt;+   &lt;p&gt;&amp;copy; 2026 Your Name&lt;/p&gt;+ &lt;/footer&gt;</code></pre>+ 			</article>+ 			<article class="card">+ 				<h3>ARIA Labels and Descriptions</h3>+ 				<p>Use ARIA attributes to provide additional context when semantic HTML alone isn't enough.</p>+ 				<pre><code>&lt;!-- Label a button with aria-label --&gt;+ &lt;button aria-label="Close dialog"&gt;×&lt;/button&gt;+ + &lt;!-- Describe an input with aria-describedby --&gt;+ &lt;input type="password" aria-describedby="pwd-hint"&gt;+ &lt;small id="pwd-hint"&gt;8+ characters, with uppercase and numbers&lt;/small&gt;+ + &lt;!-- Use aria-live for dynamic updates --&gt;+ &lt;div aria-live="polite" aria-atomic="true"&gt;+   &lt;span id="status"&gt;&lt;/span&gt;+ &lt;/div&gt;</code></pre>+ 			</article>+ 			<article class="card">+ 				<h3>Focus Management</h3>+ 				<p>Ensure focus is always visible and moves logically through the page using keyboard navigation.</p>+ 				<pre><code>/* Always show focus outlines */+ :focus-visible {+   outline: 3px solid #0052a3;+   outline-offset: 2px;+ }+ + /* Skip link for keyboard users */+ .skip-link:focus {+   transform: translateY(0);+   position: relative;+   z-index: 1000;+ }</code></pre>+ 			</article>+ 		</section>+   		<section aria-labelledby="resources">  			<h2 id="resources">Resources</h2>⋯ line 973  		if (contactForm) {  			const emailError = document.getElementById('email-error');+ 			const nameInput = document.getElementById('name');  			const submitBtn = contactForm.querySelector('button[type="submit"]');  			const isSending = () => submitBtn.getAttribute('aria-disabled') === 'true';⋯ line 1071  				submitBtn.textContent = 'Sending…';  				setFormStatus('Sending your message…', 'pending');+ 				if (nameInput) nameInput.readOnly = true;  				emailInput.readOnly = true;  				if (messageInput) messageInput.readOnly = true;⋯ line 1077  				emailInput.readOnly = false;  				if (messageInput) messageInput.readOnly = false;+ 				if (nameInput) nameInput.readOnly = false;  				contactForm.reset();  				setEmailError('');

What the model said

Perfect! I've successfully improved the 0.html file with the following enhancements:

## Improvements Made:

1. **Performance Optimization**
   - Added `dns-prefetch` links for external resources (w3.org, whatwg.org, a11y-101.com, developer.mozilla.org) to reduce DNS lookup latency

2. **Navigation Enhancement**
   - Added a "Welcome" navigation link pointing to the welcome section
   - Added `aria-current="page"` to indicate the current section
   - Added a "Code" link in navigation to the new code examples section

3. **Form Improvements**
   - Added a required "Name" field with proper labels and help text
   - Added an optional "Phone" field with tel input type and helpful format guidance
   - Updated JavaScript to handle the new fields during form submission and reset

4. **New Code Examples Section**
   - Added educational section with three practical code examples:
     - Semantic HTML structure
     - ARIA labels and descriptions  
     - Focus management techniques
   - Examples are formatted in `<pre><code>` blocks for easy copying

5. **CSS Enhancements**
   - Styled `<pre>` elements with scrollable overflow, borders, padding, and proper theming
   - Styled `<code>` elements with monospace font
   - Added print styles for `<pre>` elements with page-break protection

All changes maintain the excellent accessibility standards already present in the document, with proper semantic markup, ARIA labels, and keyboard navigation support throughout.