C#如何获得webbrowser网页里某元素所占用的位置坐标

用JS的方式获取就要用getBoundingClientRect方法，like this:

window.frames['mainframe'].document.getElementById('Img').getBoundingClientRect().left;

但是JS时灵时不灵，下面就是不用JS的方法：

public Point GetOffset(HtmlElement el)
{
    //get element pos
    Point pos = new Point(el.OffsetRectangle.Left, el.OffsetRectangle.Top);

    //get the parents pos
    HtmlElement tempEl = el.OffsetParent;
    while (tempEl != null)
    {
        pos.X += tempEl.OffsetRectangle.Left;
        pos.Y += tempEl.OffsetRectangle.Top;
        tempEl = tempEl.OffsetParent;
    }

    return pos;
}

var point = GetOffset(element);
var x = point.X;
var y = point.Y;