The @font-faceCSSat-rule allows authors to specify online fonts to display text on their web pages. By allowing authors to provide their own fonts, @font-face eliminates the need to depend on the limited number of fonts users have installed on their computers. The @font-face at-rule may be used not only at the top level of a CSS, but also inside any CSS conditional-group at-rule.
CSS Fonts is a module of CSS that defines font-related properties and how font resources are loaded. It allows to define the style of a font, like its family, its size or its weight, and the variant of the glyph to be used, for a font that has several glyphs for one character. It also allows to define the height of a line.
The font-family CSS property lets you specify a prioritized list of font family names and/or generic family names for the selected element. Values are separated by a comma to indicate that they are alternatives. The browser will select the first font on the list that is installed on the computer or that can be downloaded using a @font-face at-rule.
The font-sizeCSS property specifies the size of the font (historically the width of the capital "M"). Setting the font size may, in turn, change the size of other items, since it is used to compute the value of the em and ex<length> units.
The font-size-adjust CSS property specifies that font size should be chosen based on the height of lowercase letters rather than the height of capital letters. This is useful since the legibility of fonts, especially at small sizes, is determined more by the size of lowercase letters than by the size of capital letters.
The font-variant-caps CSS property controls the usage of alternate glyphs for capital letters. Scripts can have capital letter glyphs of different sizes, the normal uppercase glyphs, small capital glyphs, and petite capital glyphs. This property controls which alternate glyphs to use.
The font-variant-position CSS property controls the usage of alternate glyphs of smaller size positioned as superscript or subscript regarding the baseline of the font, which is set unchanged. These glyphs are likely to be used in <sub> and <sup> elements.