An object containing an array of information about the headings in the document. It should have the following form:
text: <heading text>,
url: <link to anchor associated with the heading>
headings: [<array of heading info for subheadings>]
By default, this information is generated by the component as part of its initialization process.
The component defines defaults for these selectors: If you use those defaults in your markup, you do not need to specify the selectors option. If you do choose to override any of the selectors, you can specify your custom selector using this option.
level1 through level6
These selectors identify the elements in the template that serve as containers for the different levels of header links. In the default template, these selectors identify <ul> elements.
".flc-toc-levels-level1" through ".flc-toc-levels-level6"