
    document.getElementById('iconlib_switcher').addEventListener('change',function() {
      iconlib = this.value || '';
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        bootstrap3: 'https://netdna.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css',
        fontawesome3: 'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/3.2.1/css/font-awesome.css',
        fontawesome4: 'https://cdnjs.cloudflare.com/ajax/libs