Some Basic SVG Elements
Chapter 3 describes the SVG elements that define basic graphical shapes—such as a rectangle and circle, as shown in previous examples— that directly create a visual appearance onscreen. First, this section describes a number of other SVG elements that are not necessarily immediately visible onscreen but that are useful nonetheless.
The SVG <a> element, which functions similarly to the HTML/XHTML <a> element, is considered in Chapter 5, “Creating Navigation Bars.”
The <desc> element
SVG container or graphics elements can contain a text-only description contained within a <desc> element. This description provides the opportunity to document a whole SVG document or image, or part of it, thus facilitating maintenance.