useMap method
A hash-name reference to a <map>
element;
that is a '#' followed by the value
of a name of a map element.
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Implementation
Object useMap(String id, {bool? removeIf}) {
if (removeIf != true && node.attrs != null) {
VirtualAttr attr = VirtualAttr('usemap', id);
node.attrs!.add(attr);
}
return this;
}