Finding dom element within the region

index.js

// you can use it to search for offending dom elements that causes and extra space

function findElement(conditionCallback) {
  return Array.prototype.slice.call(document.body.querySelectorAll('*')).map(
    element => ({ rect: element.getBoundingClientRect(), element })
  )
  .filter(conditionCallback)
  .map(element => element.element);
}