"To edit HTML- and CSS-code you only need a simple plaintext-editor — the rest depends on your skills and your creativity. However, to make your life a little bit easier, you can use some more comfortable source-code editors with advanced editing features. These features can effectively support you during coding, debugging and testing. Powerful modern editors provide developers with syntax highlighting, diff, macros, plugins, code-snippets, preview-option and an integrated FTP-management tool. Some editors go even further and offer a complete integrated development environment with numerous features and functions."