将HTML画布复制为剪贴板作为图像

我有一个Web应用程序，我正在为一个客户端管理，该客户端使用一个使用画布生成图形的图形库。客户希望用户能够复制站点中的任何图形，以便将其粘贴到word文档中。具体问题：

I have a web application I'm administering for a client which uses a graphing library which generates graphs using a canvas. The client wants the user to be able to copy any graph in the site so that it can be pasted into a word document. The specific question:

是否可以将HTML画布元素作为图像复制到剪贴板？

Is it possible to copy an HTML canvas element to the clipboard as an image?

我知道可以将画布保存为图像，但它比复制/粘贴更麻烦。

I know that it is possible to save a canvas as an image, but it's somewhat more cumbersome than copy/paste.

编辑：
我了解到你可以将画布转换为带有数据URI src的图像，但该图像上的复制和粘贴支持是混合的。 Firefox允许您从浏览器中复制并粘贴这些图像，但Chrome不会。

I've learned that you can convert the canvas over to an image with a data URI src, but the copy and paste support on that image is mixed. Firefox allows you to copy and paste these images out of a browser, but chrome doesn't.

截至目前，似乎没有可靠的方法复制并粘贴一个canvas元素。

As of right now, it appears that there is not a reliable way to copy and paste a canvas element.