javascript - Checking the contents of an iframe -

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i working on chrome extension helps me remember passwords websites, , needs detect web pages used login. via jquery call $("input:password"). however, ran website has login form inside iframe, , attempting call $("iframe").contents() resulted in error due cross-origin security.

is there way me reliably check contents of iframe? need know existence of password element, not interact in way.

use window.postmessage

code sample...

otherwindow.postmessage(message, targetorigin, [transfer]);

code receivemessage

window.addeventlistener("message", receivemessage, false);  function receivemessage(event){    if (event.origin !== "http://example.org:8080")    return;    // ... }

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