Modern client-side routing: the Navigation API | Web Platform | Chrome for Developers
Briefly

While SPAs have been able to bring you this feature via the History API, it's a clunky API developed long-before SPAs were the norm-and the web is crying out for a completely new approach.
Single-page applications, or SPAs, are defined by a core feature: dynamically rewriting their content as the user interacts with the site, instead of the default method of loading entirely new pages from the server.
Read at Chrome for Developers
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