Spy Navigation Needs refactoringJS

Make sure you always set the target for each navigation link by providing the data-href attribute as shown in the code example below. The target element itself needs to be an anchor tag with the `id` set to the value that you set in the data-href attribute. The anchor tag defines the start of the section you want to jump to or select when scrolling there. Important note: old links with `name` attribute are still valid, but we suggest you to use `id` instead as a HTML5 compatible.