Soft Navigation Heuristics

"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. This OT would experiment with soft navigation heuristics, and will experimentally web-expose them, so that RUM providers and developers can collect them and report back of their usefulness when collecting performance metrics.