Headings are created by prefixing a line with !headings

|!c '''Markup Text'''  |!c '''Displayed as'''|
|!- !heading         -!|Table of contents    |

Markup:
{{{!headings -style decimal}}}

|''' argument '''|''' description '''|
|-style          |The CSS style of the list items, possible values: decimal, decimal-leading-zero, lower-roman, upper-roman, lower-alpha, upper-alpha, none. Default value: decimal. |