anchor.diff:  
             // Generate our image set element
             // TODO: Show match pass/fail status (e.g. green/red)
  -          var imgSetEl = D.UL([
  +          var imgSetEl = D.UL({'data-image-set': imgSetId}, [
               D.LI([
                 // Row title
                 D.A({
                   href: 'javascript:void 0;', 'data-toggle': 'collapse',
  -                'data-target': '[data-image-set="' + imgSetId + '"]', 'aria-controls': imgSetId
  +                'data-target': '[data-image-set="' + imgSetId + '"] [data-image-set-expand]', 'aria-controls': imgSetId
                 }, imgSetHumanName),
   
                 // Collapsable container for row
  
positive.code:                 // TODO: Remove this flag, make only failing tests visible
                  // DEV: If class names get too complex, use `classnames` library
                  class: i === 0 ? 'collapse in well' : 'collapse well',
                  'data-image-set': imgSetId
                }, [
                  // Action buttons
                  D.DIV([
  
negative.code:           // TODO: Explore binding overlay to each of images (that jumps between them)
            var imgOverlay = new Overlay(imgSetEl.querySelector('img[data-compare-type=diff]'));
  
            // Save imgOverlay directly to imgSetEl
            imgSetEl.imgOverlay = imgOverlay;
  
            // Append our element to the container element
            containerEl.appendChild(imgSetEl);
          });
  