Support :hover/:active in quirks when leftmost in compound.

Source/core/css/SelectorChecker.h

Index: Source/core/css/SelectorChecker.h
diff --git a/Source/core/css/SelectorChecker.h b/Source/core/css/SelectorChecker.h
index 0e3357b94bab90fbc4b3090e64e89f2e16985189..1b6bd08f16f448a1aa588d92e23077546db48b68 100644
--- a/Source/core/css/SelectorChecker.h
+++ b/Source/core/css/SelectorChecker.h
@@ -138,6 +138,7 @@ private:
     bool checkPseudoHost(const SelectorCheckingContext&, const SiblingTraversalStrategy&, unsigned*) const;
 
     static bool isFrameFocused(const Element&);
+    bool shouldMatchHoverOrActive(const SelectorCheckingContext&) const;
 
     bool m_strictParsing;
     Mode m_mode;
@@ -179,6 +180,14 @@ inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, const
     return scope && scope->isInShadowTree() && scope->shadowHost() == element;
 }
 
+inline bool SelectorChecker::shouldMatchHoverOrActive(const SelectorCheckingContext& context) const
+{
+    // If we're in quirks mode, then :hover and :active should never match anchors with no
+    // href and *:hover and *:active should not match anything. This is specified in
+    // https://quirks.spec.whatwg.org/#the-:active-and-:hover-quirk
+    return m_strictParsing || context.isSubSelector || (context.selector->relation() == CSSSelector::SubSelector && context.selector->tagHistory()) || context.element->isLink();
+}
+
 }
 
 #endif