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chromium/third_party/blink/web_tests/fast/css/background-repeat-null-y-crash.html 

<!DOCTYPE html>
<script src="../../resources/js-test.js"></script>
<body>
<script>
  document.body.style.backgroundRepeat='repeat';
  document.body.style.backgroundRepeatY='';
  shouldBe(document.body.style.background, '');
</script>
</body>