Scroll Depth Tracking

Glass tracks scroll depth for every page on your site.

What is Scroll Depth?#

Scroll depth is how far a user has seen down a page.

It's expressed as a percentage of the total scrollable height of the page.

How is Scroll Depth calculated?#

Scroll depth is calculated by taking the height of the viewport (i.e. the bottom pixel of the browser), plus the maximum scrolled pixels, and expressing it as a percentage of the total height of the page (including the offscreen elements).

The minimum scroll depth is therefore browser height / page height.

For pages that short enough to appear entirely without scrolling, the scroll depth is 100%.

Glass calculates the average scroll depth and presents it in the pages view.