public dynamic GetRect(JQueryContext node)
{
    node.Attr("pos_top", "0");
    node.Attr("pos_left", "0");
    Default.RunScript(string.Format("var pos = $('{0}').position();$('{0}').attr('pos_top', pos.top);$('{0}').attr('pos_left', pos.left);", node.JQueryExpression));
    return new { 
        top = node.Attr("pos_top"), 
        left = node.Attr("pos_left"), 
        width = node.Css("width"), 
        height = node.Css("height")
    };
}

public void Run()
{
    Logger.ClearAll();
    Default.Navigate("http://www.gdtsearch.com/products.spiderstudio.codeviewer.htm");
    Default.Ready();
    var node = Default.SelectSingleNode("HTML:eq(0)>BODY:eq(0)>DIV:eq(0)>DIV:eq(1)>DIV:eq(0)>H2:eq(1)");
    var rect = GetRect(node);
    node.Css("background-color", "yellow"); //将元素设为高亮背景
    Logger.Log("top = " + rect.top + "px");
    Logger.Log("left = " + rect.left + "px");
    Logger.Log("width = " + rect.width);
    Logger.Log("height = " + rect.height);
}