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HTML5 processing
After the HTML5 files are generated, the html5 transformation generates a table of contents (ToC) file called index.html, which can be loaded as a cover page or rendered in a navigation sidebar or menu via CSS.
As of DITA-OT 2.2, the nav-toc parameter can be used in HTML5 transformations to embed navigation directly in topics using native HTML5 elements without JavaScript or framesets.