anchor.diff:                    D.TD({
                       style: 'vertical-align: top;'
                     }, [
  -                    D.INPUT({type: 'checkbox', checked: true})
  +                    D.INPUT({name: 'save_update', type: 'checkbox', checked: true})
                     ]),
                     D.TD({style: 'vertical-align: top;'}, [refImgClone]),
                     // TODO: Consider adding updated diff image here or placing overlay or muting non-overlay section
  
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.naturalWidth;
              canvasEl.height = refImg.naturalHeight;
              var context = canvasEl.getContext('2d');
  
negative.code:               currentImg: imageSetEl.querySelector('[data-compare-type=current]'),
                diffImg: imageSetEl.querySelector('[data-compare-type=diff]'),
                refImg: imageSetEl.querySelector('[data-compare-type=ref]'),
                id: imageSetEl.getAttribute('data-image-set'),
                humanName: imageSetEl.getAttribute('data-image-set')
              };
              if (imageSetEl === expectedImgSetEl) {
  