The font-style CSS descriptor allows authors to specify font styles for the fonts specified in the @font-face rule.
The font-family CSS descriptor allows authors to specify the font family for the font specified in an @font-face rule.
src
The src CSS descriptor of the @font-face rule specifies the resource containing font data. It is required for the @font-face rule to be valid.
The font-style CSS property lets you select italic or oblique faces within a font-family. Italic forms are generally cursive in nature, usually using less horizontal space than their unstyled counterparts, while oblique faces are usually just sloped versions of the regular face. Both italic and oblique faces are simulated by artificially sloping the glyphs of the regular face (see font-synthesis for control over this).
The FontFaceSet interface of the CSS Font Loading API is an interface for loading font faces and checking their download statuses.
The HTML element emphasis  <em> marks text that has stress emphasis. The <em> element can be nested, with each level of nesting indicating a greater degree of emphasis.
<i>
The HTML <i> Element represents a range of text that is set off from the normal text for some reason, for example, technical terms, foreign language phrases, or fictional character thoughts. It is typically displayed in italic type.
The HTML Small Element (<small>) makes the text font size one size smaller (for example, from large to medium, or from small to x-small) down to the browser's minimum font size.  In HTML5, this element is repurposed to represent side-comments and small print, including copyright and legal text, independent of its styled presentation.
The HTML Strong Element (<strong>) gives text strong importance, and is typically displayed in bold.