As of CSS3, the spec has changed, allowing for only a single font-style. A comma-separated list (per CSS2) will be treated as if it were normal and override any earlier (default) entry. This will make fonts defined in this way appear italic permanently.
@font-face {
font-family: "DejaVu Sans";
src: url("fonts/DejaVuSans.ttf");
}
@font-face {
font-family: "DejaVu Sans";
src: url("fonts/DejaVuSans-Bold.ttf");
font-weight: bold;
}
@font-face {
font-family: "DejaVu Sans";
src: url("fonts/DejaVuSans-Oblique.ttf");
font-style: italic;
}
@font-face {
font-family: "DejaVu Sans";
src: url("fonts/DejaVuSans-BoldOblique.ttf");
font-weight: bold;
font-style: italic;
}
@font-face {
font-family: "DejaVu Sans";
src: url("fonts/DejaVuSans-Oblique.ttf");
font-style: oblique;
}
@font-face {
font-family: "DejaVu Sans";
src: url("fonts/DejaVuSans-BoldOblique.ttf");
font-weight: bold;
font-style: oblique;
}
In most cases, italic will probably be sufficient and oblique rules won't be necessary if you take care to define whichever you will use and stick to it.