Print all elements and their z-index to console in descending order

snippet.js

(() => {
  const elements = Array.from(document.querySelectorAll('*'));
  const zIndexedElements = elements.map(element => ({
    element,
    zIndex: window.getComputedStyle(element).zIndex
  }))
  .filter(item => item.zIndex !== 'auto')
  .sort((a, b) => b.zIndex - a.zIndex);

  zIndexedElements.forEach(({ element, zIndex }) => {
    console.log(zIndex, element);
  })
})();