could you please explain your questions properly. I can't understand your question fully so could please give some example or explain elaborately what you need exactly?
Did you set document.domain = "yourdomain.com"; in your script in a.html. You may also want to use developer tools such as Chrome's Web Inspector to check what error is being thrown, if any.
Possible Errors:
Domains, protocols and ports must match. : make the setting above
Uncaught Error: SECURITY_ERR: DOM Exception 18 : ???
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