A Google Analytics Plugin for Measuring Page Scrolling
Scroll Depth is a small Google Analytics plugin that allows you to measure how far down the page your users are scrolling. It monitors the 25%, 50%, 75%, and 100% scroll points, sending a Google Analytics Event at each one.
You can also track when specific elements on the page are scrolled into view. On a blog, for example, you could send a Scroll Depth event whenever the user reaches the end of a post. The plugin supports Universal Analytics, Classic Google Analytics, and Google Tag Manager.
License: MIT, GPL License