debug.unusedstylesheets.js

// create list of unused stylesheet rules

$(document).ready(function()
{
    var sel = [];

    for( var s = 0 ; s < document.styleSheets.length ; s++ ) {
        var rules = document.styleSheets[s].cssRules || document.styleSheets[s].rules;

        for( var r = 0 ; r < rules.length ; r++ ) {
            if( rules[r].selectorText ) {
                var pieces = rules[r].selectorText.split(',');

                for( var p = 0 ; p < pieces.length ; p++ ) {
                    var selectorText = pieces[p].toLowerCase();
                    try {
                        if( $( selectorText ).size() == 0 ) {
                            sel.push( $.trim(selectorText) );
                        }
                    } catch( e ) {
                        console.log( selectorText );
                    }
                }
            }
        }
    }

    $(document.body).prepend( '<div class="std-msg-info"><em>Unused stylesheet rules:</em><pre>' + sel.join('\n') + '</pre></div>' );

});