3C Rating Reviews bis: Allow for partial selection

[Laoujin]

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With e a mousemove event

function getPosition(e) {
  var rect = e.target.getBoundingClientRect();
  var x = e.clientX - rect.left;
  var y = e.clientY - rect.top;
  return {  x,  y };

  // e.target.clientWidth
}

JSFiddle