Apply CSS3 attributes in real time

The for loop I have is functioning properly:

<div id="page1div"></div>
<script>

list = " ";

for (var i = 0 ; i < length ; i++)
{
    list = "<h1 class='entriesdisplayed'>" + 
               item(i) + 
               "<span class='bolditalic'> x " + 
                   description(i) + 
               " </span>" +
           "</h1>" +
           list;
}

$("#page1div").html(list);

</script>

While the above code accurately displays elements of the array, I want to emphasize description(i) in bold and italic. The current structure has description(i) wrapped in a span class="bolditalic".

In my CSS3 file, I've defined this style:

.bolditalic
{
    font: bold italic;
}

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