Closing (right-side) equal signs are optional. If both left side and right side equal signs exist, the left side takes precedence. Whitespace is allowed before the left-side equal signs. Only whitespace characters are permitted after the closing equal signs. No linebreaks are allowed within headings. No markup within a heading will be parsed. Also see headings reasoning for creole's decisions.

Creole:

= Level 1 (largest) =
== Level 2 ==
=== Level 3 ===
==== Level 4 ====
===== Level 5 =====
====== Level 6 ======
=== Also level 3
=== Also level 3 =
=== Also level 3 ==
=== **not** //parsed// ===

Recommended XHTML:

<h1>Level 1 (largest)</h1>
<h2>Level 2</h2>
<h3>Level 3</h3>
<h4>Level 4</h4>
<h5>Level 5</h5>
<h6>Level 6</h6>
<h3>Also level 3</h3>
<h3>Also level 3</h3>
<h3>Also level 3</h3>
<h3>**not** //parsed//</h3>

WikiMatrix headings syntax comparison

Unacceptable:

== Heading with [[link]]
== Heading with **bold** or //italics//
== Heading with {{Image:image|image}}
== Heading with <<6>> placeholder

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Also see All Markup