Measure scrollbar width

measure.js

function getScrollbarWidth() {
  const outer = document.createElement('div');
  outer.style.visibility = 'hidden';
  outer.style.overflow = 'scroll';
  document.body.appendChild(outer);

  
  const inner = document.createElement('div');
  outer.appendChild(inner);
  
  
  const scrollbarWidth = (outer.offsetWidth - inner.offsetWidth);

  
  outer.parentNode.removeChild(outer);

  return scrollbarWidth;
    
}