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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>accept Attribute Example</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}form{max-width:420px;padding:1.25rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:500;color:#475569}input[type=file],input[type=submit]{font:inherit}input[type=file]{display:block;width:100%;margin-bottom:.75rem}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>accept — image extensions</h1>
  <form>
    <label for=fileInput>Select an image file:</label>
    <input type=file id=fileInput name=fileInput accept=".jpg, .jpeg, .png">
    <input type=submit value=Upload>
  </form>
  <p class=hint>The file picker filters to .jpg, .jpeg, and .png files. Always validate on the server too.</p>
</body>
</html>

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HTML accept Attribute — Image File Extensions