字体变体 | font-variant

font-variant: small-caps;
font-variant: common-ligatures small-caps;

/* Global values */
font-variant: inherit;
font-variant: initial;
font-variant: unset;

normal | none | [ <common-lig-values> || <discretionary-lig-values> || <historical-lig-values> || <contextual-alt-values> || stylistic( <feature-value-name> ) || historical-forms || styleset( <feature-value-name># ) || character-variant( <feature-value-name># ) || swash( <feature-value-name> ) || ornaments( <feature-value-name> ) || annotation( <feature-value-name> ) || [ small-caps | all-small-caps | petite-caps | all-petite-caps | unicase | titling-caps ] || <numeric-figure-values> || <numeric-spacing-values> || <numeric-fraction-values> || ordinal || slashed-zero || <east-asian-variant-values> || <east-asian-width-values> || ruby ]where 
<common-lig-values> = [ common-ligatures | no-common-ligatures ]
<discretionary-lig-values> = [ discretionary-ligatures | no-discretionary-ligatures ]
<historical-lig-values> = [ historical-ligatures | no-historical-ligatures ]
<contextual-alt-values> = [ contextual | no-contextual ]
<feature-value-name> = <custom-ident>
<numeric-figure-values> = [ lining-nums | oldstyle-nums ]
<numeric-spacing-values> = [ proportional-nums | tabular-nums ]
<numeric-fraction-values> = [ diagonal-fractions | stacked-fractions ]
<east-asian-variant-values> = [ jis78 | jis83 | jis90 | jis04 | simplified | traditional ]
<east-asian-width-values> = [ full-width | proportional-width ]

<p class="normal">Firefox rocks!</p>
<p class="small">Firefox rocks!</p>

p.normal {
  font-variant: normal;
}
p.small {
  font-variant: small-caps;
}