pub fn htmlcanvaselement_get_set_fill_style()
{
    let document = web_sys::window().unwrap().document().unwrap();
    let canvas = document.get_element_by_id("canvas").unwrap();
    let canvas: web_sys::HtmlCanvasElement = canvas
        .dyn_into::<web_sys::HtmlCanvasElement>()
        .map_err(|_| ())
        .unwrap();
    
    let context = canvas
        .get_context("2d")
        .unwrap()
        .unwrap()
        .dyn_into::<web_sys::CanvasRenderingContext2d>()
        .unwrap();

    //context.set_fill_style(&"#0000FF".into());     
    context.set_fill_style(&"rgb(150,50,0)".into());        
    
    context.fill_rect(15.0, 15.0, 80.0, 80.0);

    web_sys::console::log_2(&"Color : %s ".into(),&context.fill_style().into());
}