adding: 0;
            }
            .c1
            {
                background: blue;
                color: blue;
                height: 1em;
            }
            .c2
            {
                background: purple;
                color: purple;
                height: 5em;
            }
        </style>
    </head>
    <body>
        <p>Test passes if the blue and purple boxes below are half the height of the black box.</p>
        <div id="reference">
            <table>
  