a[href*="://www"] {
    color: green;
}

a[target="_blank"]:after {
    content: " \21D2";
    color: coral;
}

a[href^="https://"]:before {
    content: "\00BB";
    padding-right: 10px;
}

a[href^="http://"]:before {
    content: "\00D7";
    color: red;
    padding-right: 10px;
}

a[href$="a"]:hover:after {
    content: " \2026 last symbol is 'a'";
    color: coral;
    font-style: italic;
}