Colors names to Hex values

Hi people,
I've a question, nothing transcendental, but a useful trick.
This code converts a color name (like "navyblue" or "green") to his 
hexadecimal correspondent:

function nameToHex(colorName) {
      document.bgColor = colorName;
      return document.bgColor;
}

did you know an alternative that doesn't use the document object?
Something like this (that doesn't works):

function nameToHex(colorName) {
   var fooDiv = document.createElement("div");    
fooDiv.style.backgrouundColor = colorName;
   return fooDiv.style.backgrouundColor;
}

Thanks a lot,
   Bye!


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