Created attachment 388673 [details]
Sample to reproduce the bug

What I intended to do
* I want to set/send a cookie from an iframe.

What actually happened
* No cookies were set/send.

How to reproduce

Requirements:
* two network interfaces (e.g.: wlan, eth)
* python3
* safari > 11.1
Setup:
* identify your ip addresses from your interfaces e.g.: ip addr
* e.g.: wlp3s0: 192.168.1.2 , enp0s31f6: 192.168.1.3
* Add this to your "/etc/hosts":
* 192.168.1.2 iframe.safari.vcom
* 192.168.1.3 www.safari.vcom
* extract example.zip
Start
parent:
* For a binding on port 80 root rights are required.
* cd cookie-playground/parent
* sudo python httpServer.py
iframe:
* For a binding on port 80 root rights are required.
* cd cookie-playground/iframe
* sudo python httpServer.py

open http://www.safari.vcom with safari > 11.1