<!doctype html>
<html>
<head>
<style>
    /* (1, 2, 1) */
    :nth-child(even of target.foo, .foo#bar, target.foo#bar, target#bar) {
        background-color: red;
        color: white;
        border: 5px solid purple;
    }

    /* (0, 1, 1) */
    target.foo {
        color: red;
    }
    /* (0, 2, 1) */
    target.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 class="foo">Red text with black border.</target>
        <target class="foo">White text on red background with purple border.</target>
        <target id="bar">Black text with blue border.</target>
        <target id="bar">White text on red background with purple border.</target>
        <target class="foo" id="bar">Red text on green background with blue border.</target>
        <target class="foo" id="bar">White text on red background with purple border.</target>
    </div>
</body>
</html>