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chromium/third_party/blink/web_tests/paint/invalidation/position/background-position-no-image.html 

<!DOCTYPE html>
<script src="../resources/text-based-repaint.js"></script>
<script>
  function repaintTest() {
    // Changing the background position for an element without a background
    // image should not trigger a repaint.
    document.getElementById("container").style.backgroundPosition = "30% 30%";
  }
  window.onload = runRepaintTest;
</script>
<style>
  #container {
    width: 100px;
    height: 100px;
    background-color: green;
  }
</style>
<div id="container"></div>