[SOLVED] Cannot communicate with web page

Help & Support
1

i want to make a text input on my host page,and show the value in the game.'
And i read and follow the manual of communicating with webpage. Code on both host page and application,I try several time, it always fail to communicate
this is my project link. Hope some one can help me .thank you
https://playcanvas.com/project/546192/overview/firstgame

2

What exactly doesn’t work?..

4

i search and figuer out ,<iframe>tag src link should add “/e”。