Return Value of ShowModalDialog Is Always Set to UNDEFINED for the About: Protocol In Internet Explorer 6.0

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This article was previously published under Q327315

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SYMPTOMS

When you use the About: Protocol with the ShowModalDialog function in a script on Microsoft Internet Explorer version 6.0, the return value of ShowModalDialog is always set to UNDEFINED (NULL). This problem does not occur with earlier versions of Internet Explorer.

To reproduce this issue, create the following HTM page :

<html>
<body>

<SCRIPT>
function MyMsgBox()
{
 url='about:<html><body onload="window.returnValue =true">test</body></html>';
 var result = window.showModalDialog (url);
 alert (result);
}
</SCRIPT>

<body onload="MyMsgBox()">
test
</body>
</html>

If you use Internet Explorer version 6.0 to load the page, Window.ShowModalDialog returns a value of UNDEFINED

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