As I need both responsive resizing and zooming iframes one day:
- [WayBack] Making Embedded Content Work In A Responsive iFrame — Smashing Magazine
- [WayBack] How can I make an iframe responsively scale? – Answers
- [Archive.is] Responsive IFrames — The Right Way (CSS Only)! | Ben Marshall
- [WayBack] zoom dashboard – JSFiddle
- [WayBack] html – How can I scale the content of an iframe? – Stack Overflow
–jeroen