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To use a downloadable font called Gentium:

@font-face {
font-family: Gentium;
src: url(http://site/fonts/Gentium.ttf);
}

p { font-family: Gentium, serif; }
The user agent will download Gentium and use it when rendering text within paragraph elements. If for some reason the site serving the font is unavailable, the default serif font will be used.
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