How can I scale the content of an iframe?

Question

How can I scale the content of an iframe (in my example it is an HTML page, and is not a popup) in a page of my web site?

For example, I want to display the content

Answer 1

So probably not the best solution, but seems to work OK.

Obviously not trying to fix the parent, just adding the "zoom:50%" style to the body of the child with a bit of javascript.

Maybe could set the style of the "HTML" element, but didn't try that.