What is “above-the-fold content” in Google Pagespeed?

Question

Until recently, my site (www.heatexchangers.ca) scored 98% on Google Page Speed. There were a couple of things I could do nothing about such as the query string from web fo

Answer 1

Above-the-fold content is the portion of the webpage that is visible in a browser window when the page first loads. Google wants to see inline CSS extracted from your main CSS file and injected into the head tag, allowing everything you see first to be loaded first.

source - https://www.c2experience.com/blog/passing-googles-abovethefold-css#:~:text=Above%2Dthe%2Dfold%20content%20is,first%20to%20be%20loaded%20first.