     }

            #constrained-flex {
                display: flex;
                width: 10px;
            }

            #test-flex-item-overlapping-green {
                color: green;
                background-color: green;
                font: 50px/1 Ahem;
            }
        ]]></style>
    </head>
    <body>
        <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

        <div id="reference-overlapped-red"></div>
        <div id="constrained-flex">
         