API’s allow external application to connect to and use cloud based services such as Facebook and Dropbox. Platforms create API’s for specific programming languages and use specific procedures to allow access to data and services.
You can format hyperlinks based on whether you’re hovering over them, actively clicking on them, or have visited them. This can be useful when creating dashboards and control panels. linkStyle.css link.html
Classes allow you to format text in different tags similarly. Classes can be reused numerous times on a page, and they can be combined together. class.html classStyle.css
You can do some interesting things with color on your HTML pages with color options with CSS. Color Picker: https://www.w3schools.com/colors/colors_picker.asp Color Names: https://www.w3schools.com/colors/colors_names.asp color.html colorStyle.css