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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>srcset — dynamic update</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 1rem;font-size:1.25rem;color:#0f172a}img{max-width:100%;height:auto;border:1px solid #cbd5e1;border-radius:6px;display:block;margin-bottom:1rem}button{font:inherit;padding:.45rem .9rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Dynamic srcset</h1>

  <img id=dynamicImage src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='500' height='80'%3E%3Crect fill='%23e2e8f0' width='500' height='80'/%3E%3Ctext x='250' y='48' text-anchor='middle' fill='%23475569' font-family='system-ui' font-size='12'%3ELoading...%3C/text%3E%3C/svg%3E" alt="Responsive image">

  <button type=button id=loadBtn>Apply srcset</button>

  <script>document.getElementById("loadBtn").addEventListener("click",(function(){var t=document.getElementById("dynamicImage");t.srcset="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='500' height='80'%3E%3Crect fill='%23dbeafe' width='500' height='80'/%3E%3Ctext x='250' y='48' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='12'%3E500w%3C/text%3E%3C/svg%3E 500w, data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1000' height='80'%3E%3Crect fill='%23bfdbfe' width='1000' height='80'/%3E%3Ctext x='500' y='48' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='12'%3E1000w%3C/text%3E%3C/svg%3E 1000w, data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1500' height='80'%3E%3Crect fill='%2393c5fd' width='1500' height='80'/%3E%3Ctext x='750' y='48' text-anchor='middle' fill='%231e40af' font-family='system-ui' font-size='12'%3E1500w%3C/text%3E%3C/svg%3E 1500w",t.sizes="(max-width: 600px) 500px, (max-width: 1200px) 900px, 1400px"}))</script>

</body>

</html>
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HTML srcset Attribute — Dynamic JavaScript Update
