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<head>

  <meta charset=UTF-8>

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

  <title>sizes — responsive image</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{max-width:100%;height:auto;border:1px solid #cbd5e1;border-radius:6px;display:block}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

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<body>

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

  <p>Resize the window. The browser picks a srcset candidate based on the slot size from <code>sizes</code>.</p>

  <img src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80'%3E%3Crect fill='%23dbeafe' width='80' height='80'/%3E%3Ctext x='40' y='46' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='12'%3E80w%3C/text%3E%3C/svg%3E" alt="Demo image with responsive srcset" srcset="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40'%3E%3Crect fill='%23dbeafe' width='40' height='40'/%3E%3Ctext x='20' y='24' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='9'%3E40w%3C/text%3E%3C/svg%3E 40w, data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80'%3E%3Crect fill='%23bfdbfe' width='80' height='80'/%3E%3Ctext x='40' y='46' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='12'%3E80w%3C/text%3E%3C/svg%3E 80w, data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Crect fill='%2393c5fd' width='120' height='120'/%3E%3Ctext x='60' y='68' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='14'%3E120w%3C/text%3E%3C/svg%3E 120w" sizes="(max-width: 600px) 100vw,

           (max-width: 1200px) 50vw,

           120px">

  <p class=hint>Below 600px the slot is <code>100vw</code>; up to 1200px it is <code>50vw</code>; above that, <code>120px</code>.</p>

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HTML sizes Attribute — Responsive img with srcset
