html · chain · relay · step 013 of 64
offline render, Chrome 154, light scheme, 2 s of virtual time
runs in a sandboxed frame with no origin; live pages may fetch CDN fonts the offline render did not
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<meta http-equiv="content-security-policy" content="default-src 'self'; style-src 'unsafe-inline'; img-src 'self' 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 with modern best practices.">
<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 name="author" content="ksmith@centricle.com">
<title>Welcome</title>
<link rel="icon" 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://example.com/">
<meta property="og:type" content="website">
<meta property="og:title" content="Welcome">
<meta property="og:description" content="A well-structured, accessible HTML5 document with modern best practices.">
<meta property="og:url" content="https://example.com/">
<meta property="og:image" content="https://example.com/og-image.png">
<meta property="og:locale" content="en_US">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Welcome">
<meta name="twitter:description" content="A well-structured, accessible HTML5 document with modern best practices.">
<meta name="twitter:image" content="https://example.com/og-image.png">
<style>
:root {
color-scheme: light dark;
--text: #1a1a1a;
--text-secondary: #555;
--background: #fff;
--accent: #0052a3;
--border: #e0e0e0;
}
@media (prefers-color-scheme: dark) {
:root {
--text: #e0e0e0;
--text-secondary: #a0a0a0;
--background: #121212;
--accent: #5fa3ff;
--border: #333;
}
}
*,
*::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;
}
}
body {
display: grid;
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;
max-width: 70ch;
margin: 0 auto;
padding: max(1.25rem, env(safe-area-inset-top)) max(1.25rem, env(safe-area-inset-right)) max(1.25rem, env(safe-area-inset-bottom)) max(1.25rem, 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;
}
p {
text-wrap: pretty;
margin: 1rem 0;
}
a {
color: var(--accent);
text-underline-offset: 0.2em;
text-decoration-thickness: 2px;
font-weight: 500;
}
a:hover, a:active {
text-decoration-thickness: 3px;
}
:focus-visible {
outline: 2px solid var(--accent);
outline-offset: 2px;
}
.skip-link {
position: absolute;
left: 0;
top: 0;
transform: translateY(-100%);
background: var(--accent);
color: var(--background);
padding: 0.75rem 1.5rem;
z-index: 1000;
border-radius: 0 0 0.25rem 0;
font-weight: 600;
text-decoration: none;
display: inline-block;
}
.skip-link:focus {
transform: none;
outline: 3px solid var(--text);
outline-offset: -3px;
}
header {
padding-block: 1.5rem;
margin-bottom: 1.5rem;
}
main {
padding: 1rem 0;
}
main:focus {
outline: none;
}
footer {
padding-block: 1.5rem;
margin-top: 3rem;
border-top: 1px solid var(--border);
font-size: 0.875rem;
color: var(--text-secondary);
text-align: center;
}
footer p {
margin: 0.5rem 0;
}
@media print {
.skip-link {
display: none;
}
body {
display: block;
min-height: 0;
max-width: none;
padding: 0;
}
a {
color: inherit;
text-decoration: underline;
}
}
</style>
</head>
<body>
<a class="skip-link" href="#main">Skip to content</a>
<header>
<h1>Welcome</h1>
</header>
<main id="main" tabindex="-1">
<p>This is a well-structured, accessible HTML5 document.</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>
</main>
<footer>
<p>© 2026. All rights reserved.</p>
</footer>
</body>
</html>
what changed from step 012
+8 / -24 lines
<head> <meta charset="utf-8">- <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover, user-scalable=yes">+ <meta http-equiv="content-security-policy" content="default-src 'self'; style-src 'unsafe-inline'; img-src 'self' 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 with modern best practices."> <meta name="color-scheme" content="light dark">- <meta http-equiv="content-security-policy" content="default-src 'self'; style-src 'unsafe-inline';"> <meta name="theme-color" content="#ffffff" media="(prefers-color-scheme: light)"> <meta name="theme-color" content="#121212" media="(prefers-color-scheme: dark)"> <meta name="author" content="ksmith@centricle.com">- <meta name="robots" content="index, follow"> <title>Welcome</title>- <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>👋</text></svg>">+ <link rel="icon" 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://example.com/"> <meta property="og:type" content="website">⋯ line 67 min-height: 100dvh; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;- font-size: 16px;+ font-size: 1rem; line-height: 1.6;- letter-spacing: 0.3px; max-width: 70ch; margin: 0 auto;⋯ line 77 h1 { color: var(--accent);- font-size: 2.5rem;+ font-size: clamp(1.75rem, 1.25rem + 3vw, 2.5rem); font-weight: 700; line-height: 1.1;⋯ line 97 text-decoration-thickness: 3px; }- a:visited {- opacity: 0.8;- } :focus-visible { outline: 2px solid var(--accent);⋯ line 141 margin: 0.5rem 0; }- @media (max-width: 640px) {- h1 {- font-size: 1.75rem;- }- body {- max-width: 100%;- }- } @media print { .skip-link {⋯ line 170 </p> <p>- Features include improved color contrast for accessibility (WCAG AA compliant),- better typography with consistent sizing, and smooth interactions.+ 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> </main> <footer>- <p>© <span id="year">2026</span>. All rights reserved.</p>+ <p>© 2026. All rights reserved.</p> </footer>- <script>- document.getElementById('year').textContent = new Date().getFullYear();- </script> </body> </html>
What the model said
I made seven edits to `0.html`, mostly fixing things that were silently broken. It's untested in a browser, and the automated structure check I tried was blocked by the session's permissions, so I only re-read the result by eye.
## Bugs fixed
- **Favicon blocked by the page's own CSP.** The policy didn't allow `data:` images, so the 👋 icon was refused. I added `img-src 'self' data:` and percent-encoded the angle brackets in the icon's URI.
- **Footer year script never ran.** The CSP blocks inline scripts, so the script was dead code. I removed it and kept the static `2026`, which leaves the page with no JavaScript and the policy strict.
- **`a:visited { opacity: 0.8 }` did nothing.** Browsers ignore `opacity` on `:visited` for privacy reasons, so I removed the rule.
- **`font-size: 16px` on `body` overrode the reader's browser font-size setting.** It is now `1rem`.
## Cleanup
- **CSP:** moved it to directly after the charset declaration and added `base-uri 'none'` and `form-action 'none'`.
- **Heading size:** replaced the 640px breakpoint with a `clamp()` on the `h1`, so it scales smoothly from 1.75rem to 2.5rem.
- **Redundant defaults:** removed `user-scalable=yes`, the `robots` "index, follow" meta tag, and the `max-width: 100%` override.
- **Letter spacing:** removed `letter-spacing: 0.3px` from body text.
- **Body copy:** reworded the third paragraph, which read like a changelog ("improved", "better"), to describe what the page does.
## Left for you to decide
- **Placeholder URLs:** the canonical link, `og:url`, `og:image` and `twitter:image` all point at `example.com`. Swap in the real ones before publishing, or drop them.
- **Email in the author tag:** `<meta name="author">` holds your email address, which scrapers can harvest. A name is more conventional there.
- **Footer year:** it will need a manual update each year. If you would rather have it automatic, move the script to an external `.js` file, which `default-src 'self'` already allows.