Running the following example in Firefox 3b1 throws a
NS_ERROR_NOT_IMPLEMENTED exception.
The same code returns "true" in Firefox 2.

<script>
        var error;
        document.designMode='on';
        try {
                alert(  document.queryCommandEnabled( "formatblock" ) );
        }
        catch( error ) {
                alert( error );
        }
</script>


Does anyone have any insight into what might have changed in this
regard?
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