font-variant: small-caps;
font-size: 12px;
Firefox:
You can target the browsers individually by using css hacks like this:
@-moz-document url-prefix() {
//firefox specific css here
}
@media screen and (-webkit-min-device-pixel-ratio:0) {
//chrome specific css here - this will also hit other webkit browsers like safari tho
}
A nicer way however in my opinion involves a tiny bit of javascript that detects the browser and sets a class on the html element and then you can use that class as a base for targeting the individual browsers.
in the end it would look something like this:
...
.firefox .rulename {
//firefox specific css here
}
and of course the same for chrome and whatever else browser