[CSS] Add stub for font-variation-settings

This stub is added because websites insist on considering this
very hardware-dependent and O.S.-variable low-level font-control
as a "critical feature" which it isn't as there is 0 guarantee
that font variation settings are supported or honored by any
operating system used by the client.

On top this is a WD status feature that sites shouldn't be using, and
the feature itself is strongly discouraged for use in favor of standard
CSS font manipulation keywords like `font-weight`.

1 files changed, 10 insertions, 0 deletions

diff --git a/layout/style/nsComputedDOMStyle.cpp b/layout/style/nsComputedDOMStyle.cpp
index 647f7f6dc..c717d59c8 100644
--- a/layout/style/nsComputedDOMStyle.cpp
+++ b/layout/style/nsComputedDOMStyle.cpp
@@ -1620,6 +1620,16 @@ nsComputedDOMStyle::DoGetFontFeatureSettings()
 }
 
 already_AddRefed<CSSValue>
+nsComputedDOMStyle::DoGetFontVariationSettings()
+{
+  // TODO: This is still a stub, always returning "normal"
+  RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
+
+  val->SetIdent(eCSSKeyword_normal);
+  return val.forget();
+}
+
+already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetFontKerning()
 {
   RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;