Including the Entree Federation WAYF-screen (Where Are You From) in a FRAME or IFRAME on the website of a Service Provider is not supported by Kennisnet.
The Entree Federation WAYF-screen is responsive (https://en.wikipedia.org/wiki/Responsive_web_design) and designed for optimal use on numerous devices and screensizes. In order to guarantee an optimal and consistent user experience it is necessary the WAYF-screen is shown in the full browser window.
From a design and security point of view external webpages should not be loaded into a FRAME or IFRAME. It makes it harder for a user to verify the authenticity of the page and this increases the risc of phishing (http://en.wikipedia.org/wiki/Phishing).