All modes that use C style folding (C, JavaScript, CSS, etc...) (SQL Server mode also supports this) support non-standard code folding using special comment notations:

• Supported using lineComment or blockComment (blockComment is needed primarily for CSS mode)
• The pound symbol # is optional before region and endregion
• lineComment example:

//#region [optional description]
     [code that will be folded here]
//#endregion 

• blockComment example:

/*#region [optional description]*/
     [code that will be folded here]
/*#endregion*/

A simpler alternative to #region sintax is to add { or [ at the end of line comment

// [optional description] {
     [code that will be folded here]
// }

• Single line blockComments that start with 3 stars will render a fold widget that folds the comment and the code below it

/*** [section title] ***/
[code that will be folded here]

/*** [next section title] ***/