[dawnerd]

> This is the most valid argument. We solved by being clever about History.pushstate(), triggering when the next article title hits 50% of screen. Bookmarking works fine.

As a user this bothers me the most. If I have no intention of reading the next article but scroll to the end it then takes two clicks to leave the site via back button - sometimes more.

IF you wanted to do it right, only set history when the title of the next article is at the top of the viewport. 50% just isn't enough and likely just messing up your kpis.