How do I retrieve an XUL element’s actual width and height?

问题

I wanna get the actual width of a <xul:hbox> element for presentation. How can I get it? I see HTML element has offsetWidth attribute but I can't find this attribute in XUL element

回答1:

Using element.getBoundingClientRect() or the older element.boxObject.width.

来源：https://stackoverflow.com/questions/1997419/how-do-i-retrieve-an-xul-element-s-actual-width-and-height