They communicate how far a user is into a story in an easy-to-digest method. Scroll indicators have become very popular on content-heavy websites.
It uses CSS IDs coupled with jQuery to make the navigation work. This handy snippet adds a button (available in a variety of styles) to the bottom of the screen that allows users to click and scroll to the next section down. Modern webpages are often broken down into multiple content sections – each with its own distinct elements.
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