Glossary

html
CSS (Cascading Style Sheets) is a language for describing the rendering of HTML and XML documents on screen, on paper, in speech, etc. It uses color-related properties and values to color the text, backgrounds, borders, and other parts of elements in a document.
javascript
The HTML <body> tag defines the main content of the HTML document or the section of the HTML document that will be directly visible on your web page.
<head> tag
key/value pair