How many users get the bottom of your page?

How long does it take to get to the footer?

Do they see the whole page? Do they only see half and leave the page?

Example of page percentage seen

All those questions can be answered thanks to a new Tag Manager tag.

Scroll Depth Tag

Example of Tag Manager trigger for scroll depth

Depending on the design of the page it does not make sense to send 25% if you see 50% of page just entering.