Parse "font-variation-settings" property (#230)

Signed-off-by: Simon Wülker <[email protected]>

Author: simonwuelker

style/properties/longhands/font.mako.rs

@@ -243,7 +243,7 @@ ${helpers.predefined_type(
     "font-variation-settings",
     "FontVariationSettings",
     engines="gecko servo",
-    servo_pref="layout.unimplemented",
+    servo_pref="layout.variable_fonts.enabled",
     gecko_pref="layout.css.font-variations.enabled",
     has_effect_on_gecko_scrollbars=False,
     initial_value="computed::FontVariationSettings::normal()",