<!DOCTYPE html>
<html>
<body>
<p>This test passes if there is no red showing.</p>

<div style="display: flex; width: 100px;">
    <div style="order: 2; background-color: green; width: 100px; height: 100px; margin-left: -50px;"></div>
    <div style="order: 1; background-color: red;   width: 50px;  height: 100px;"></div>
</div>
</body>
</html>