javascript - Allow a child iframe (cross site) access to window.top -

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i trying display web site in iframe. iframe url points internally hosted web server in corporation, although have no control on whatsoever , 'cross site' has different subdomain site. further, code maintained 3rd party company , takes long time changes this... banks , like! creators of content have stated there no intention prevent displaying/running web site in iframe.

we using cisco finesse "bring together" various 3rd party , locally developed web applications. (background, finesse uses apache shindig host 'gadgets'). @ technical level, want have single url gadget displayed in finesse, uses iframe display 3rd party page.

the problem far, there piece of code on 3rd party page tries access "window.top.location" , of course security exception thrown. here code: 

function somefunc() {     var toppage = window.top;     if (toppage.location.pathname.indexof("default") == -1) {        return toppage;     }     return toppage; }

the page url of form, http://domain/default.aspx - standard aspx default page , can't figure out why check being performed in manner.

having debugged little find code used in several locations no apparent reason. ie. doesn't need top page , looks me attempt prevent "something", i'm not sure , neither current maintainers of site.

i have tried same code in small test site see behaviour. if host site "default" in pathname (not cross site) function behaves 'as expected' (again, i'm not sure expectation is) , function returns 'toppage' no problems within child iframe (remember not cross site).

i have looked lot around net , stackoverflow, , far close requires changes 3rd party site (which cannot), haven't found case same. @ point quite sure there nothing can do, here ask gurus second opinions.

basically want know if there can do, hack, allow iframe access window.top?


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