What Are Purple Numbers?

Purple numbers provide a way to address pieces of an HTML document.    (01)

For example, if the filename of this slide were "slide.html" and you wanted to create an HTML link to the above paragraph, you could write:    (02)

    <a href="slide.html#nid01">The first paragraph of slide.html</a>  (03)
                        

This HTML code creates a link to the paragraph marked "nid01" in the file "slide.html".    (04)