Checks whether the element @id exists in the SVG document.
Element IDs should look like an URL fragment identifier; for example, pass #foo (hash foo) to get the geometry of the element that has an id="foo" attribute.
An element's id within the SVG, starting with "#" (a single hash character), for example, #layer1. This notation corresponds to a URL's fragment ID.
TRUE if @id exists in the SVG document, FALSE otherwise.
2.22
See Implementation
Checks whether the element @id exists in the SVG document.
Element IDs should look like an URL fragment identifier; for example, pass #foo (hash foo) to get the geometry of the element that has an id="foo" attribute.