Return the bounding box of the element after transformations are applied. Unlike vel.bbox(), this function fixes a browser implementation bug to return the correct bounding box if this elemenent is a group of svg elements (if options.recursive is specified). The
options argument is optional. Two attributes may be provided inside the object. If
options.target is not undefined, bounding box will be computed relatively to the transformations of the
target element; if it is undefined, the bounding box will be computed relatively to the element calling the function. If
options.recursive is true, the bounding box is computed as a union of all individual descendants' bounding boxes.