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Test Info:

<!DOCTYPE html>
<html><head>
<meta http-equiv="content-type" content="text/html; charset=windows-1252">
<script>
function boom()
{
x.style.display = "contents";
}
</script>
</head>
<body onload="boom();">
<div style="column-width: 1px;">
<div style="display: grid;">
<div style="height: 200px;">v</div>
<div style="height: 200px;" id="x">x</div>
</div>
</div>
</body>
</html>