Hi 3cL1p5e7,
We realize that it is inconvenient that currently iFrames do not work on the Internet Computer. But adding proper support for iFrames (without introducing any security risks) is a bit of work. It is definitely on our roadmap, but I cannot give promises regarding release dates.
For the time being, we have removed iFrames from the Internet Identity specification to avoid developer confusion.
I hope this helps.
Best regards,
Frederik