HTML CSS

<h1>Upload a "Hello World" demo to codepen</h1>
<form action="https://codepen.io/pen/define" method="POST" target="_blank">
  <input type="hidden" name="data" value="{&quot;title&quot;:&quot;Hello World!&quot;, &quot;html&quot;:&quot;<h1>Hello, World!</h1>&quot;, &quot;css&quot;: &quot;h1 { color: green;}&quot;}">

  <input type="submit" value="Upload demo">
</form>