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Test Info:

<!DOCTYPE html>
<title>flexbox | block</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<link rel="help"
<link rel="match" href="../reference/blank.html">
<style>
div {
background: red;
margin-top: -20em;
display: flex;
}
</style>
<div>FAIL</div>