Dynamics 365 portal in iFrame

Hi

I am using the new Dynamics 365 portal (old Adxstudio) to build my web site.

One requirement is to embed the portal in an iFrame. I did the configuration and it is working.

However some of my links in the web pages as rendered with attribute target ="_top". When the link is clicked inside the iFrame the browser changes url changes from the parent site to the portal , thus quitting the parent side.

The desired effect is to open the target page inside the iFrame.

I am wondering why this target="_top" is added, and if there is a way to handle this by some configuration in the portal.

Thank you