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  let fadeOut = (target, duration=500) => {
    target.style.transitionProperty = 'opacity';
    target.style.transitionDuration = duration + 'ms';
    target.style.opacity = 0;
    window.setTimeout( () => {
      target.style.display = 'none';
      target.style.removeProperty('opacity');
      target.style.removeProperty('transition-duration');
      target.style.removeProperty('transition-property');