2.1.8 [CSS3Fonts:2018] Section 6.6. Capitalization: the font-variant-caps property
V0006: The font-variant-caps property is not supported
The specification states:
6.6. Capitalization: the font-variant-caps property Name: font-variant-caps ... This property allows the selection of alternate glyphs used for small or petite capitals or for titling. These glyphs are specifically designed to blend well with the surrounding normal glyphs, to maintain the weight and readability which suffers when text is simply resized to fit this purpose.
is not supported.