The font-variation-settings
CSS descriptor allows authors to specify low-level OpenType or TrueType font variations in the @font-face
at-rule. The values for this descriptor are the same as the font-variation-settings
property, except for the global keyword values.
Since this descriptor sets variation values on the font object in the @font-face
at-rule and not on an entire element, only some glyphs in an element may be rendered using this descriptor.