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comment by ran

If you use a Webkit browser (Safari, Chrome or Epiphany), you can also use hue-rotate to swap the colors without using your own image. This will turn the clicked wheel into a purple color, for example:

    -webkit-filter: hue-rotate(90deg);
As far as I know, this is unsupported in Gecko as of now, so there's no equivalent `-moz-filter` property for Firefox.