I doubt iframes can stretch to the content even with JS.
Maybe for special cases, where the content is from the same domain or is actively messaging the size outwards so you can code some interplay between the outer page and the iframe. But neither side can do it alone.
Maybe for special cases, where the content is from the same domain or is actively messaging the size outwards so you can code some interplay between the outer page and the iframe. But neither side can do it alone.