
Originally Posted by
Facebook Developers
We are also moving toward IFrames instead of FBML for both canvas applications and Page tabs. As a part of this process, we will be standardizing on a small set of core FBML tags that will work with both applications on Facebook and external Web pages via our JavaScript SDK, effectively eliminating the technical difference between developing an application on and off Facebook.com.
We will begin supporting IFrames for Page tabs in the next few months. Developers building canvas applications should start using IFrames immediately. By the end of this year, we will no longer allow new FBML applications to be created, so all new canvas applications and Page tabs will have to be based on IFrames and our JavaScript SDK. We will, however, continue to support existing implementations of the older authentication mechanism as well as FBML on Page tabs and applications.
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