anchor.diff:                currentImg: imageSetEl.querySelector('[data-compare-type=current]'),
                 diffImg: imageSetEl.querySelector('[data-compare-type=diff]'),
                 refImg: imageSetEl.querySelector('[data-compare-type=ref]'),
  -              humanName: imageSetEl.dataset['image-set']
  +              humanName: imageSetEl.getAttribute('data-image-set')
               };
             });
   
  
positive.code:             // Create a canvas
              // https://github.com/scijs/get-pixels/blob/7c447cd979637b31e47e148f238a1e71611af481/dom-pixels.js#L14-L18
              var canvasEl = document.createElement('canvas');
              canvasEl.width = refImg.width;
              canvasEl.height = refImg.height;
              var context = canvasEl.getContext('2d');
  
              // Load our reference into the canvas
  
negative.code:                 }, [
                    D.INPUT({type: 'checkbox', checked: true})
                  ]),
                  D.TD({style: 'vertical-align: top;'}, [refImgClone]),
                  D.TD({style: 'vertical-align: top;'}, [canvasEl])
                ])
              ]);
              resultsDocFrag.appendChild(resultGroupEl);
  