Valid only for `<text>` subelements. `textPath` can be either a string or an object. If it is a string, it specifies a path the text should go along. If it is an object, then it should contain a d property that specifies the path the text should go along and optinally other attributes that will be set on the automatically created `<textPath>` SVG element such as startOffset. See text() method of Vectorizer objects for more details.