anchor.diff:  
             // Find our sets of images to update
             var imageSetEls = document.querySelectorAll('[data-image-set]');
  +          imageSetEls = Array.prototype.slice.call(imageSetEls);
  +
  +          // Remove original matching image set
  +          imageSetEls = imageSetEls.filter(function removeOriginalImageSet (imageSetEl) {
  +            return imageSetEl !== expectedImgSetEl;
  +          });
   
             // Convert image sets into objects so we can add metadata
  -          var imageSetInfos = Array.prototype.map.call(imageSetEls, function createImageSet (imageSetEl, i) {
  +          var imageSetInfos = imageSetEls.map(function createImageSetInfo (imageSetEl) {
               return {
                 currentImg: imageSetEl.querySelector('[data-compare-type=current]'),
                 diffImg: imageSetEl.querySelector('[data-compare-type=diff]'),
  
positive.code:               ]),
                D.TR([
                  // TODO: Move style out of inline and to classes for more performance
                  D.TD({style: 'padding-right: 10px;'}, 'Save update:'),
                  D.TD('Original ref:'),
                  D.TD('Updated ref:')
                ]),
  
negative.code:             // Duplicate reference image and shrink both canvas/image for output
              canvasEl.style.width = '100%';
              var refImgClone = refImg.cloneNode();
              refImgClone.style.width = '100%';
  
              // Generate and append result content
              // DEV: We use a document fragment to avoid `n` DOM edits -- instead it's 1
  