<defs>... defined elements ...
|defs||The defs element has no parameters|
<defs> element is used as a container element for elements that are intended to be used solely by reference and not rendered directly. Elements that would normally be rendered (e.g.
<circle>) that are declared inside a
<defs> block are treated as if their style included
Although it's not strictly necessary, the SVG spec. recommends putting all gradient, filter, pattern, mask, symbol, and marker definitions within a