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

  <title>srcset — width descriptors</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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  <h1>srcset with 500w, 1000w, 1500w</h1>

  <img src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='500' height='100'%3E%3Crect fill='%23dbeafe' width='500' height='100'/%3E%3Ctext x='250' y='58' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='14'%3E500w fallback%3C/text%3E%3C/svg%3E" alt="Responsive image with srcset width descriptors" srcset="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='500' height='100'%3E%3Crect fill='%23dbeafe' width='500' height='100'/%3E%3Ctext x='250' y='58' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='14'%3E500w%3C/text%3E%3C/svg%3E 500w, data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1000' height='100'%3E%3Crect fill='%23bfdbfe' width='1000' height='100'/%3E%3Ctext x='500' y='58' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='14'%3E1000w%3C/text%3E%3C/svg%3E 1000w, data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1500' height='100'%3E%3Crect fill='%2393c5fd' width='1500' height='100'/%3E%3Ctext x='750' y='58' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='14'%3E1500w%3C/text%3E%3C/svg%3E 1500w" sizes="(max-width: 600px) 100vw, 800px">

  <p class=hint>The <code>w</code> descriptor is the intrinsic width of each file. Pair with <code>sizes</code> so the browser picks the best candidate.</p>

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HTML srcset Attribute — Width Descriptors (w)
