I created some demo code to show how to send messages between a parent page and IFRAME, and specifically how to use that to modify IFRAME height and prevent internal scrolls

(To be clear, me and Claude created this....)

I work a lot in enterprise integration scenarios -- intranets and such. Element isolation in IFRAMEs is becoming a bigger and bigger thing, because a lot of intranets are huge integration situations, where content is being pulled in from all over, and you really don't want it all in the same DOM and styling space.

The goal is this was to work with IFRAMEs in such a way that they could be completely transparent to the user. I wanted to be able to contain anything in an IFRAME without the user being aware that it wasn't all one consolidated DOM.

The code in this page largely succeeds at that, I think.