TEMPLATE
TEMPLATE: string = `<div class="box"><header></header><div class="content"><main data-anchor="main"></main><!--annotation toolbar--><aside class="annotations" style="display:none"><div><h2>Annotations</h2></div><div class="btn-group" role="group" aria-label="annotations"><button class="btn btn-default btn-xs" title="add text annotation" data-ann="text"><i class="fa fa-font"></i></button><button class="btn btn-default btn-xs" title="add arrow" data-ann="arrow"><i class="fa fa-arrow-right"></i></button><button class="btn btn-default btn-xs" title="add frame" data-ann="frame"><i class="fa fa-square-o"></i></button></div></aside></div></div>`