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chromium/third_party/blink/web_tests/external/wpt/html/semantics/selectors/pseudo-classes/indeterminate-radio.html 

<!DOCTYPE HTML>
<meta charset="utf-8">
<title>:indeterminate and input type=radio</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style type="text/css">
#test {
  color: green;
}
input:indeterminate + #test {
  color: red;
}
</style>
<input type="radio" name="radios">
<div id="test"></div>
<input type="radio" name="radios" checked>
<script type="text/javascript">
test(function() {
  document.getElementsByTagName("input")[0].indeterminate = true;
  var target = document.getElementById("test");
  var val = getComputedStyle(target, null).getPropertyValue("color");
  assert_equals(val, "rgb(0, 128, 0)",
                "The indeterminate IDL attribute should not cause the " +
                ":indeterminate pseudo-class to match on input type=radio");
})
</script>