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I tried using the top.location.hash approach to have a site on a different domain (also within an iframe) set the top windows hash value to its own height, but I’ve now discovered this isn’t cross domain safe.
What other options do I have to make sure that the iframe constantly resets it’s height when the iframe document is finished loading?
You can use window.postMessage() to communicate across domains. See http://caniuse.com/#search=postmessage for the current level of support – pretty much all browsers and even MSIE starting with MSIE 8.