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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>sizes — picture element</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}img,picture{display:block;max-width:100%;height:auto;border:1px solid #cbd5e1;border-radius:6px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>sizes on &lt;source&gt;</h1>

  <p>Inside <code>&lt;picture&gt;</code>, <code>sizes</code> on <code>&lt;source&gt;</code> helps the browser choose art direction or resolution variants.</p>

  <picture>

    <source media="(min-width: 700px)" srcset="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='80'%3E%3Crect fill='%23c4b5fd' width='240' height='80'/%3E%3Ctext x='120' y='48' text-anchor='middle' fill='%235b21b6' font-family='system-ui' font-size='13'%3EWide 240w%3C/text%3E%3C/svg%3E 240w, data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='480' height='160'%3E%3Crect fill='%23a78bfa' width='480' height='160'/%3E%3Ctext x='240' y='92' text-anchor='middle' fill='%235b21b6' font-family='system-ui' font-size='18'%3EWide 480w%3C/text%3E%3C/svg%3E 480w" sizes="(min-width: 1200px) 480px, 50vw">

    <img src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='80'%3E%3Crect fill='%23ddd6fe' width='160' height='80'/%3E%3Ctext x='80' y='48' text-anchor='middle' fill='%235b21b6' font-family='system-ui' font-size='12'%3EFallback%3C/text%3E%3C/svg%3E" alt="Responsive banner demo" width=160 height=80>

  </picture>

  <p class=hint>Wide screens load the purple banner from <code>source</code>; narrow screens use the fallback <code>img</code>.</p>

</body>

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HTML sizes Attribute — picture and source
