foo.foo {
        border: 5px solid black;
    }

    /* (1, 1, 0) */
    .foo#bar {
        background-color: green;
    }
    /* (1, 0, 1) */
    target#bar {
        border: 5px solid blue;
    }

    target {
        display: block;
        margin: 2px;
    }
</style>
</head>
<body>
    <div>
        <target>Black text.</target>
        <target>Black text.</target>
        <target id="bar">Black text with blue border.</target>
        <target class="foo">White text on red background with purple border.<