The source code for an OpenLaszlo application is an XML document, or a collection of XML documents. Every OpenLaszlo application begins with a set of <canvas> </canvas> tags. Other tags are then included to add functionality to the application. In this example, the <text> tag was used to display 'Hello World'. Every tag has attributes that allows you to modify their appearance or behavior. To experiment in the example above try changing...

<canvas> to <canvas bgcolor="#666699"> ...or...
<text> to <text fgcolor="#CAD0EC">

Then press the Update button. The application is recompiled and you can see the results of your changes in the running application area.