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<div>
    Stored value is
    <span></span>
    and
    <span></span>
</div>
<script>
$(function () { 
    var div = $( "div" )[ 0 ];
    jQuery.data( div, "test", {
        first: 16,
        last: "pizza!"
    });
    $( "span:first" ).text( jQuery.data( div, "test" ).first );
    $( "span:last" ).text( jQuery.data( div, "test" ).last );
})
</script>

jQuery.data(document.body, 'foo', 52);
jQuery.data(document.body, 'bar', 'test');

alert(jQuery.data( document.body, 'foo' ));
alert(jQuery.data( document.body ));