About:Edit is a browser-based text and source code editor written in JavaScript and PHP. About:Edit provides full control over text manipulation, including complete keyboard support; multiple documents editing; syntax highlighting for PHP, HTML, CSS and JavaScript; unlimited undo and redo; smart tabs and indents; copy/paste operations and more - just about everything you'd expect from a decent text and source code editor. About:Edit is highly customizable, secure, loads fast and is easy to use even for complex editing tasks.