:::
9. classes and IDs(2個重要的選擇器)
10. Links(3種超連結CSS)
There are a number of useful pseudo-class selectors for links, including:
a:link: An unvisited link.
a:visited: A visited link.
a:hover: A link you're hovering your mouse over.
a:link {
color:#008B45;
text-decoration:none;
}
a:hover {
color:#00FF00;
}
a:visited {
color:#EE9A00;
}