<!DOCTYPE html> <!-- webkit-test-runner [ IOSFormControlRefreshEnabled=true ] -->
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<script>
function runTest() {
    document.getElementById("checkbox").indeterminate = true;
}
</script>
<body onload="runTest()">
<input type="checkbox" id="checkbox">
</body>
</html>
