IE9/10/11/Firefox中的iframe页面不更新文档。页面大小变化时的滚动高度?

I'm attempting to send the height of my page from an iframe to the parent page using the postMessage API. The idea is that when the total page height of the iframed page changes, it will send that height to the parent. The parent will then adjust the iframe's height to match. I currently have this working great in the latest Google Chrome.I'm attempting to send the height of my page fr