The CSS background-color property defines the background color of an element.
"ARPANET adopted TCP/IP on January 1, 1983, and from there researchers began to assemble the “network of networks” that became the modern Internet."
https://www.history.com/news/who-invented-the-internet
"Domain hosts provide domain names, which help visitors access your web content."
https://support.squarespace.com/hc/en-us/articles/215754007-Web-hosting-vs-domain-hosting
"HTML stands for Hypertext Markup Language, and is used to describe the visual appearance of a document to be displayed by a internet browser."
https://www.tech-faq.com/how-does-html-work.html