SVG stands for Scalable Vector Graphics. It’s an XML-based image format that describes graphics using geometrical attributes. Unlike HTML5 Canvas, which is another standard for vector graphics, SVG primitives are made of individual XML elements described using tags and attributes. It is also object-based and provides a DOM, which allows CSS styling, dynamic shape creation and manipulation, and coordinate transforms using JavaScript or CSS.
To control SVG elements with D3 you should understand basic SVG syntax and rules, how a document is structured, how each element is rendered, the effects caused by attributes and styles, as well as nesting and transformation rules.
All the code used in this section is available in the SVG/ folder, from the GitHub repository for this chapter. You can see the results simply loading the pages in your browser...
