text-shadow

Shadows are another common feature of modern Web designs. Shadows add an
element of depth to a page, but they can also enhance readability (if used properly)
to lift a headline from the page. The text-shadow attribute was technically
part of CSS2, but it has only recently been supported by major browsers:
h2 {
font-size: 300%;
text-shadow: 3px 3px 5px #666666;
}