WebDriverTests/imported/selenium/common/src/web/screen/screen.js

function toColor(num) {
  num >>>= 0;
  var b = num & 0xFF,
    g = (num & 0xFF00) >>> 8,
    r = (num & 0xFF0000) >>> 16;
  return "rgb(" + [r, g, b].join(",") + ")";
}