The new generation of web browsers — Firefox 3, Opera 9.5 and Internet Explorer 7 — provides a feature which seems to save a lot of work for web-developers in the future, namely the Full Page Zoom. Instead of allowing users to increase and decrease the font size on a given web-site, browsers now enable users to literally scale the rendered layout including visuals and background images.
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.
When it comes to coding editors, it's damn hard to a get a clear overview of all the benefits and functionalities different editors have to offer. However, in the end everybody needs one, so it's important to know which editor is best tailored to your personal needs.
WYSIWYG-editors are often criticized by real coding ninjas for bloated, dirty and not standards-complaint source code they've been producing over the last years. However, WYSIWYG-editors have become much better recently. Some of them even produce valid and elegant code.