jQuery: How to count the number of elements which "display" isn't "none"?

Try this:

$('tr:not([style*="display: none"])').length

Example http://jsfiddle.net/infernalbadger/7LvD5/

Filter your rows based on their actual CSS property:

$('tr').filter(function() {
    return $(this).css('display') !== 'none';
}).length;

jquery selector to count the number of visible table rows?

Change !== to ===

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