Specifies the location where any child elements of the bound element are placed in the generated content.
Normally, if the element bound to has its own content, the anonymous content is not generated. However, with a children element, you can merge the content from the XUL element and the XBL content.
Attributes:
Attributes inherited from Element
The style class of the children. Multiple classes may be specified by separating them with spaces.
A unique identifier so that you can identify the children with. You can use this as a parameter to getElementById and other DOM functions and to reference the element in style sheets.