DEMO BLOCKQUOTE WITH LINE NUMBERING

<script type="text/javascript">

//<![CDATA[

var pre = document.getElementsByTagName('blockquote'),

    pl = pre.length;

for (var i = 0; i < pl; i++) {

    pre[i].innerHTML = '<span class="line-number"></span>' + pre[i].innerHTML + '<span class="cl"></span>';

    var num = pre[i].innerHTML.split(/\n/).length;

    for (var j = 0; j < num; j++) {

        var line_num = pre[i].getElementsByTagName('span')[0];

        line_num.innerHTML += '<span>' + (j+1) + '</span>';

    }

}

//]]>

</script>

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