Store features in the ScopedStyleResoolver.

sky/engine/core/dom/Element.h

Index: sky/engine/core/dom/Element.h
diff --git a/sky/engine/core/dom/Element.h b/sky/engine/core/dom/Element.h
index 0cb5b0d4d9c012747cbbffd1e81e9d5b41c44d33..9c3169644223ce80e8047fcbae8e70789775be74 100644
--- a/sky/engine/core/dom/Element.h
+++ b/sky/engine/core/dom/Element.h
@@ -163,6 +163,10 @@ public:
 
     void invalidateStyleAttribute();
 
+    bool affectedByAttributeSelector(const AtomicString& attributeName) const;
+    bool affectedByClassSelector(const AtomicString& classValue) const;
+    bool affectedByIdSelector(const AtomicString& idValue) const;
+
     const StylePropertySet* inlineStyle() const { return elementData() ? elementData()->m_inlineStyle.get() : 0; }
 
     bool setInlineStyleProperty(CSSPropertyID, CSSValueID identifier, bool important = false);
@@ -327,6 +331,8 @@ protected:
 private:
     void attributeChanged(const QualifiedName&, const AtomicString&, AttributeModificationReason = ModifiedDirectly);
 
+    bool classChangeNeedsStyleRecalc(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses);
+
     bool hasElementFlag(ElementFlags mask) const { return hasRareData() && hasElementFlagInternal(mask); }
     void setElementFlag(ElementFlags, bool value = true);
     void clearElementFlag(ElementFlags);