Interaction between elements in different iframes is very restricted.
IIRC, you can communicate entire JSON objects between an iframe and it's host frame with PostMessage.
The host can then act as a server for the iframe client, even updating it's state or DOM in response to a message from the iframe.
alt Hacker News
IIRC, you can communicate entire JSON objects between an iframe and it's host frame with PostMessage.
The host can then act as a server for the iframe client, even updating it's state or DOM in response to a message from the iframe.