widget must have one includable

the basic tags for creating widgets are described in Page Element Tags for Layouts. If you just want to use the Page Elements tab to work with everything, then that's all you need to know. However, if you want more fine-grained control, this article describes what you can put inside a widget, if you're working in the "Expand Widget Templates" mode of the Edit HTML page.

The first thing to do is to add a closing tag. So this:





becomes this:


Now with that out of the way, let's talk about what you can put between those tags.

Includes

Widget content is contained in "includable" sections, which have this format:

    [insert whatever content you want here]

The attributes are as follows:

• id: (Required) A unique identifier made up of letters and numbers.
• var: (Optional) An identifier made up of letters and numbers, for referencing data within this section. (See the data section below.)

Each widget must have one includable with id='main'. This will usually contain most or all of the content that will display for this widget, and in many cases it will be all you need.
If you make more includables with different IDs, they will not be displayed automatically. However, if you make an includable with id='new', then you can reference it in your main includable with