The original setOpacity function just reset the opacity value in case
the value is one. Which means that you use the class value (if
exist) :

  setOpacity: function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
    return element;
  },


I perdsonnally think that the function should react this way:

  setOpacity: function(element, value) {
    element = $(element);
    element.style.opacity = (value === '') ? '' :
      (value < 0.00001) ? 0 : (value > 0.99999) ? 1 :value;
    return element;
  },

My question is if the original function are used this way for a
specific browser support?

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