To use HTML in the playground page, log in as developer with the password developer. Type in the opening and closing html tags, and everything between these tags will be treated as HTML:
<html>
<h1>Html found here</h1>
</html>
The playground page may be used without html, using the standard Dokuwiki syntax, which is described on the syntax page. Standard Dokuwiki syntax can be intermixed with HTML syntax:
==== Standard Header 3 markup ====
<html>
<h1>Html found here</h1>
</html>
==== Standard **bold face** markup ====
<html>
<b>Html found here</b>
</html>
The playground page will allow for HTML at access level M.