I have included the following files in my framework (Yii2)
'canvas-theme\canvas-css\css\components\select-boxes.css',
'canvas-theme\canvas-js\js\jquery.js',
'canvas-theme\canvas-js\js\components\select-boxes.js',
'canvas-theme\canvas-js\js\components\selectsplitter.js',
'canvas-theme\canvas-js\js\can-function.js',
but the Tagging Support in http://themes.semicolonweb.com/html/canvas/component-select-box.php doesn't work proprely with the following code :
<div class="site-index">
<div class="bottommargin-sm">
<label for="">Tagging Support</label>
<select class="select-tags form-control select2-hidden-accessible" multiple="" tabindex="-1" aria-hidden="true">
<option selected="selected">orange</option>
<option>white</option>
<option selected="selected">purple</option>
<option value="red">red</option>
<option value="blue">blue</option>
<option value="green">green</option>
</select><span class="select2 select2-container select2-container--default select2-container--below select2-container--focus select2-container--open" dir="ltr" style="width: 690px;"><span class="selection"><span class="select2-selection select2-selection--multiple" role="combobox" aria-haspopup="true" aria-expanded="true" tabindex="-1" aria-owns="select2-w2a5-results" aria-activedescendant="select2-w2a5-result-a825-orange"><ul class="select2-selection__rendered"><li class="select2-search select2-search--inline"><input class="select2-search__field" type="search" tabindex="-1" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" role="textbox" aria-autocomplete="list" placeholder="" style="width: 0.75em;"></li></ul></span></span><span class="dropdown-wrapper" aria-hidden="true"></span></span>
</div>