: How does an adsense bot determine the "Above the fold" space on mobile and desktop sites? I ran an experiment last night by replacing a small ad for a mobile site thats located near the top

@LarsenBagley505

I think we should start from these facts:


This algorithmic change noticeably affects less than 1% of searches globally.


...


On a typical website, it can take several weeks for Googlebot to crawl and process enough pages to reflect layout changes on the site.

googlewebmastercentral.blogspot.it/2012/01/page-layout-algorithm-improvement.html
I don't think your changes are due to Google algorithms.
Probably, it can be a simple variation in one day, so you need to wait and collect more data (and it can't even be enough, it's easy to fall in post hoc fallacy).
In the best scenario, maybe you simply improved user experience on your website.

What should you use for measuring browser size?
The PageSpeed Insights tool developers.google.com/speed/pagespeed/insights/ so you can have an average of what mobile users can see.

Then, use the Browser Size function of In-Page analysis on Google Analytics (the old Google Labs' Browser Size). This tool let you see the percentile of web users that see a specific portion of a web page. In that way, you can actually identify what most people see as above the fold.

Then, simply follow the Google AdSense guidelines support.google.com/adsense/answer/1346295?hl=en
This is a screenshots shared across the web

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