fn compute_used_font_features(
options: &ShapingOptions,
font_face_rule: Option<&FontFaceRule>,
) -> impl Iterator<Item = (Tag, u32)>Expand description
Determine which OpenType features are applied for the font.
The order of precedence for resolving font-specific font feature properties is specified in https://drafts.csswg.org/css-fonts-4/#apply-font-matching-variations.