javascript - How to kill zombie cookies -


i'm not sure if question related this one or not.

ie9 deletes cookie after closing browser (expected) chrome 12, firefox 5, , opera 11 not. (during testing of example below, each browser closed after clicking "delete account." reopened after short period of time , in ie9 cookies still there.)

use case: cookie expires 1 year after last visit user. account deletion should remove cookie.

question:
(1/2) why ie9 right (expected) thing , others not?
(2/2) how can ensure browsers destroy cookie?

example:

login.html

<!doctype html> <html>     <head>         <title>create cookie example</title>          <script>             function setcookie() {                 var expdate = new date();                 expdate.setdate(expdate.getdate() + 365);                 document.cookie = "fakecookie=" + escape("fake value")                     + "; expires=" + expdate.togmtstring();             }         </script>     </head>      <body onload="setcookie()">         <h1>welcome</h1>         <p>lorem ipsum...</p>         <hr size="1" />         <p><a href="profile.html">user profile</a></p>     </body> </html>

profile.html

<!doctype html> <html>     <head>         <title>delete cookie example</title>          <script>             function deleteconfirm() {                 if ( confirm("are sure want delete account? "                            + "all data lost; action cannot undone!")                    ) deleteconfirmed()                 else return false                  return true;             }              function deleteconfirmed() {                 document.cookie = "fakecookie=; expires=thu, 01-jan-70 00:00:01 gmt";             }         </script>     </head>      <body>         <h1>user profile</h1>         <p>lorem ipsum...</p>         <hr size="1" />         <p><a href="index.html" onclick="return deleteconfirm()">delete account</a></p>     </body> </html>

edit: original post incorrectly identified login.html index.html (forming circular reference recreate cookie when "account" deleted.)

the op came answer , edited question. repost keep solution in answer post, semantics.

        <script>             function deleteconfirm() {                 if ( confirm("are sure want delete account? "                            + "all data lost; action cannot undone!")                    ) deleteconfirmed(); // <-- ** missed semicolon here **                 else return false;      // <-- ** , here **                  return true;             }              function deleteconfirmed() {                 document.cookie = "fakecookie=; expires=thu, 01-jan-70 00:00:01 gmt";             }         </script>

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