Introduction

“Soft navigations” are JS-driven same-document navigations that are using the history API or the new Navigation API, triggered by a user gesture and modifies the DOM, modifying the previous content, as well as the URL displayed to the user.

w3c/performance-timeline#168 outlines the desire to be able to better report performance metrics on soft navigation. Heuristics for detecting soft navigations can ensure that developers that follow a well-lit path can ensure their SPA’s performance metric scores properly represent soft navigations.

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