| Index: Source/core/css/RuleSet.cpp | 
| diff --git a/Source/core/css/RuleSet.cpp b/Source/core/css/RuleSet.cpp | 
| index d7d56bfa00d70b4c35c69787d068665af8bee9db..2ffda78c0c6b383e914e434ce39743c7f0a64836 100644 | 
| --- a/Source/core/css/RuleSet.cpp | 
| +++ b/Source/core/css/RuleSet.cpp | 
| @@ -393,7 +393,7 @@ void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase> >& rules, const M | 
| resolver->setBuildScopedStyleTreeInDocumentOrder(false); | 
| resolver->ensureScopedStyleResolver(scope->shadowHost())->addHostRule(static_cast<StyleRuleHost*>(rule), hasDocumentSecurityOrigin, scope); | 
| resolver->setBuildScopedStyleTreeInDocumentOrder(enabled); | 
| -        } else if (RuntimeEnabledFeatures::cssViewportEnabled() && rule->isViewportRule()) { | 
| +        } else if (rule->isViewportRule()) { | 
| // @viewport should not be scoped. | 
| if (!isDocumentScope(scope)) | 
| continue; | 
|  |