Unlike many other visual HTML editors, Dreamweaver has always graciously accepted HTML written by hand (and even by other programs). In fact, Dreamweaver has always made it easy to jump between itself and text-editing programs like HomeSite (for Windows) and BBEdit (for the Mac).
This ability, which Macromedia calls Roundtrip HTML, lets Web developers write code the way they want, without worrying that Dreamweaver will change it. For example, suppose you have a particular way of formatting your handwritten code. Maybe you insert an extra carriage return after every <td> (table cell) tag or like to use multiple tabs to indent nested tags. In such cases, Dreamweaver won’t try to rewrite that to fit its own style—unless you ask it to.