The first time you see the content on your web page is considered a part of back end development code example

Example 1: what's backend

In the computer world, the "backend" refers to any part of a website or software program that users do not see.

Example 2: front end and back end meaning

The term “front-end” refers to the user interface, while “back-end” means the
server, application and database that work behind the scenes to deliver
information to the user.