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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>Dynamic download name</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}a{display:inline-block;padding:.5rem .85rem;background:#2563eb;color:#fff;text-decoration:none;border-radius:6px;font-size:.875rem}p{font-size:.875rem;color:#64748b;max-width:520px;margin-top:1rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Generate a download filename in JavaScript</h1>

  <a id=dynamicDownloadLink href=data:text/plain,Hello%20World!>Download text file</a>

  <p id=info></p>

  <script>var link=document.getElementById("dynamicDownloadLink");link.download="generated_file.txt",document.getElementById("info").textContent="download property set to: "+link.download</script>

</body>

</html>

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HTML download Attribute — Dynamic Filename