The numeric interval (in milliseconds) at which the hashchange event polling loop executes.

If you’re setting document.domain in your JavaScript, and you want hash history to work in IE6/7, not only must this property be set, but you must also set document.domain BEFORE jQuery is loaded into the page.

If, for some reason, you need to specify an Iframe src file (for example, when setting document.domain as in jQuery.fn.hashchange.domain), you can do so using this property.