Variable fonts
Variable fonts are an extension of the OpenType 1.8 format, which allows you to store an infinite number of typefaces and designs in a single file. The designer can set various text parameters — width, slope, fatness, serif shape — and the typographic engine will draw the text with such parameters. The use of variable fonts in web design gives the designer not only more opportunities, but also allows you to speed up the work of web pages, since one variable font file weighs less than several files, each with its own font.
Specialists from such companies as Apple, Adobe, Microsoft and Google participated in the development of the specification of variable fonts.
At the moment, all modern versions of browsers and graphics programs support variable fonts.