To provide a custom user interface for your server behavior extension, Dreamweaver includes an HTML engine designed for the Dreamweaver environment. Essentially, the Dreamweaver HTML engine lets you design the user interface for your extensions, including server behaviors, using HTML much like a web page.
If you look at the code in an HTM file that accompanies a server behavior, you will see that the DOCTYPE HTML tag differs from web page HTML. In HTML intended for a web browser, the DOCTYPE tag usually looks like the following example: