anchor.diff:                // TODO: Show match pass/fail status
                 D.A({
                   href: 'javascript:void 0;', 'data-toggle': 'collapse',
  -                'data-target': '[data-id="' + imgSetId + '"]',
  -                'aria-expanded': 'false', 'aria-controls': imgSetId
  +                'data-target': '[data-id="' + imgSetId + '"]', 'aria-controls': imgSetId
                 }, imgSetHumanName),
                 D.TABLE({
  -                className: 'collapse', 'data-id': imgSetId
  +                // Make our first image set visible
  +                // TODO: Remove this flag, make only failing tests visible
  +                // DEV: If class names get too complex, use `classnames` library
  +                class: i === 0 ? 'collapse in' : 'collapse', 'data-id': imgSetId
                 }, [
                   D.TR([
                     D.TD('Current:'),
  
positive.code:         var imgHeight = '250';
          var imageSets = window.imageSets;
          var docFrag = document.createDocumentFragment();
          imageSets.forEach(function createImageSet (imgSet) {
            // Create local variables for our image set
            var imgSetId = imgSet.refImg;
            var imgSetHumanName = imgSet.refImg;
  
negative.code:                     // TODO: Ditch `expected-diff-img` as we have multiple images now
                      D.IMG({
                        'data-compare-type': 'diff', src: '/images/' + imgSet.diffImg,
                        height: imgHeight, class: 'expected-diff-img'
                      })
                    ]),
                    D.TD([
  