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I want to do cross domain messaging between an iframe and its parent. The new javascript postMessage api looks perfect and this jquery plugin provides a fallback for older browsers by using location.hash. Now the message I want to pass is of a fairly large (approx 500 characters). Will there be any problems/issues with having a large location.hash value in the older browsers which don’t support the postMessage api?
Internet Explorer 8 and lower have known issues with URLs that are over 2,083 characters. Providing you stay under this limit, you should be fine in all browsers.