HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>formmethod — preview vs save</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}textarea{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit;min-height:5rem}.actions{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.75rem}button{font:inherit;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}button:first-child{background:#64748b}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>formmethod — preview vs save</h1>
  <form action=/articles method=post onsubmit=return!1>
    <textarea name=body required placeholder="Write your article..."></textarea>
    <div class=actions>
      <button type=submit formmethod=get formaction=/articles/preview>Preview</button>
      <button type=submit>Save</button>
    </div>

“Preview” sends a GET to /articles/preview. “Save” uses the form’s default POST method.

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HTML formmethod Attribute — Preview vs Save