Rails spinoffs - Dec 2005 - Element.setOpacity issue in script.aculo.us effects

In the Element.setOpacity method definition in effects.js, there is a
line that sets the opacity to 0.999999 if the requested opacity is 1.
This is clearly there for a reason, but having a very slight
transparency actually makes my pages look bad - images are the worst,
but I can see the backgrounds through my supposedly opaque elements.

 

Why is 1 bad for this value? 

 

Here''s the code in question:

 

Element.setOpacity = function(element, value){  

  element= $(element);  

  var els = element.style;  

  if (value == 1){  

    els.opacity = ''0.999999'';  

                ....



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