Why did this jQuery input selector require a filter workaround
===

The following line This does NOT work in my code in firefox/firebug (but works fine in JSFIDDLE), you will see below I have a work around, just wondering if anyone knows the internal reason  why?

    var checkedVal = parseInt($('input[@name=' + uniqueNamePart + 'currDim]:checked').val(), 10);

http://jsfiddle.net/darrenshrwd/eqh2y/43/

    <input type="radio" value="1" name="blahcurrDim">One
    <input type="radio" checked="" value="2" name="blahcurrDim">Two
    <input type="radio" value="3" name="blahcurrDim">Three
    <input type="radio" value="4" name="blahcurrDim">Four

​...

    $('document').ready(
    
    function() {
    
        var uniqueNamePart = "blah";
    
        var dimensionClick = function() {
    
            // This does NOT work in my code in firefox/firebug (but works fine in JSFIDDLE):
            var checkedVal = parseInt($('input[@name=' + uniqueNamePart + 'currDim]:checked').val(), 10);
            
            // This does work in both:
            //var myRadio = $('input[name=' + uniqueNamePart  + 'currDim]'),
            //    checkedVal = parseInt(myRadio.filter(':checked').val(), 10);        
            
            alert(checkedVal);
    
        };
    
        $('input[name=' + uniqueNamePart + 'currDim]:radio').click(dimensionClick);
    
    });