PdfDocumentOptionsGenerateDocumentOutline Property

A flag indicating if the generated PDF document will have an outline with bookmarks created from HTML heading tags (H1 to H6) or from any element marked with the data-heading attribute. Any element can become a bookmark with data-heading set to a level from 1 to 6 (for example data-heading="2"), the bookmark title is taken from the data-heading-text attribute when present otherwise from the element text. A real heading can be excluded with data-heading="false". The custom data-heading attribute is honored only in custom mode when UseBrowserOutlineMode is false. The default is false

public bool GenerateDocumentOutline { get; set; }