pub fn svgelement_set_attribute()-> Result<(), JsValue>
    {
        let window = web_sys::window().expect("global window does not exists");    
        let document = window.document().expect("expecting a document on window");
        let body = document.body().expect("document expect to have have a body");
        
        let svg = document.create_element_ns(Some("http://www.w3.org/2000/svg"), "svg")
        .unwrap()
        .dyn_into::<web_sys::SvgElement>()
        .map_err(|_| ())
        .unwrap();
    
        svg
        .style()
        .set_property("border", "solid")?;
    
        svg.set_attribute("width","500")?;
        svg.set_attribute("height","500")?;
        svg.set_attribute("viewBox", "0 0 500 500")?;
    
        let circle = document.create_element_ns(Some("http://www.w3.org/2000/svg"), "circle")?;
        circle.set_attribute("cx", "100")?;
        circle.set_attribute("cy", "100")?;
        circle.set_attribute("r", "60")?;
        circle.set_attribute("stroke", "black")?;
        circle.set_attribute("fill", "blue")?;
        svg.append_child(&circle)?;
    
        body.append_child(&svg)?;
    
        Ok(())
    }