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<!doctype html>
<h1>Hello, <code>world</code>.</h1>
<p>Edit this HTML or open a file. The preview updates as you type.</p>
<style>
body { margin: 24px; font: 18px/1.6 system-ui; color: #18181b; background: #fafafa; }
h1 { font-size: 32px; line-height: 1.2; }
</style>
