//copy the following into browser console and run
(()=>{
  let root=document.querySelector('div[itemprop="reviewBody"]'),
      selCalc = sel => [].slice.call(root.querySelectorAll(sel)).reduce((v,el)=> v + (parseFloat(getComputedStyle(el).height) || 0), 0),
      totalImageHeight = selCalc('div[align="center"] img'), totalTextHeight = selCalc('p'),
      totalHeight = totalImageHeight + totalTextHeight;
  console.log('Percentage: images - ' + (100*totalImageHeight/totalHeight).toFixed(2) + '%, text - ' + (100*totalTextHeight/totalHeight).toFixed(2) + '%')
  console.log('Paschenism ratio:', (totalImageHeight/totalTextHeight).toFixed(2))
})()