From a technical standpoint
This page has broken down its content into different pages and uses the
For a user: This is all one page of content that can be smoothly scrolled through. Once a 'floor' is hit, it dynamically loads in the next 'page'.
For a crawler or browser: This is seen as several pages in a paginated directory structure (eg.
It's important to use Use 'rel=next|prev' link headers to indicate pagination and allow Google to crawl this structure seamlessly. Google also has a blog post about optimising infinite scrolling.
There are guides on how to effectively implement this page structure and scripting.
How is this treated from an SEO perspective?
Like any other piece of paginated content. The initial page is given precedence and following pages are treated as subsidiaries.