diff --git a/bridge/core/css/css_selector.cc b/bridge/core/css/css_selector.cc
index 8dc8d4e2e..1acdc3500 100644
--- a/bridge/core/css/css_selector.cc
+++ b/bridge/core/css/css_selector.cc
@@ -720,7 +720,7 @@ void CSSSelector::UpdatePseudoPage(const AtomicString& value,
                                    const Document* document) {
   DCHECK_EQ(Match(), kPagePseudoClass);
   SetValue(value);
-  PseudoType type = CSSSelectorParser::ParsePseudoType(value.ToStdString(), false, document);
+  PseudoType type = CSSSelectorParser::ParsePseudoType(value, false, document);
   if (type != kPseudoFirstPage && type != kPseudoLeftPage &&
       type != kPseudoRightPage) {
     type = kPseudoUnknown;
@@ -735,7 +735,7 @@ void CSSSelector::UpdatePseudoType(const AtomicString& value,
   DCHECK(Match() == kPseudoClass || Match() == kPseudoElement);
   AtomicString lower_value = value.LowerASCII();
   PseudoType pseudo_type = CSSSelectorParser::ParsePseudoType(
-      lower_value.ToStdString(), has_arguments, context.GetDocument());
+      lower_value, has_arguments, context.GetDocument());
   SetPseudoType(pseudo_type);
   SetValue(pseudo_type == kPseudoStateDeprecatedSyntax ? value : lower_value);
 
diff --git a/bridge/core/css/parser/css_lazy_parsing_test.cc b/bridge/core/css/parser/css_lazy_parsing_test.cc
index e05ff9a93..86f1ee0b4 100644
--- a/bridge/core/css/parser/css_lazy_parsing_test.cc
+++ b/bridge/core/css/parser/css_lazy_parsing_test.cc
@@ -15,7 +15,9 @@ class CSSLazyParsingTest : public testing::Test {
  public:
   bool HasParsedProperties(StyleRule* rule) { return rule->HasParsedProperties(); }
 
-  StyleRule* RuleAt(StyleSheetContents* sheet, size_t index) { return To<StyleRule>(sheet->ChildRules()[index].get()); }
+  StyleRule* RuleAt(StyleSheetContents* sheet, size_t index) {
+    return To<StyleRule>(sheet->ChildRules()[index].get());
+  }
 
  protected:
   std::shared_ptr<StyleSheetContents> cached_contents_;
diff --git a/bridge/core/css/parser/css_parser_impl.cc b/bridge/core/css/parser/css_parser_impl.cc
index fc87aeb54..5d1f2a792 100644
--- a/bridge/core/css/parser/css_parser_impl.cc
+++ b/bridge/core/css/parser/css_parser_impl.cc
@@ -363,7 +363,6 @@ static CSSParserImpl::AllowedRulesType ComputeNewAllowedRules(CSSParserImpl::All
   return CSSParserImpl::kRegularRules;
 }
 
-// TODO:当前进度[ConsumeQualifiedRule]
 template <typename T>
 bool CSSParserImpl::ConsumeRuleList(CSSParserTokenStream& stream,
                                     RuleListType rule_list_type,
diff --git a/bridge/core/css/parser/css_selector_parser.cc b/bridge/core/css/parser/css_selector_parser.cc
index 4ff739242..48f3bf11d 100644
--- a/bridge/core/css/parser/css_selector_parser.cc
+++ b/bridge/core/css/parser/css_selector_parser.cc
@@ -903,7 +903,7 @@ bool CSSSelectorParser::ConsumePartialComplexSelector(CSSParserTokenStream& stre
 }
 
 // static
-CSSSelector::PseudoType CSSSelectorParser::ParsePseudoType(const std::string& name,
+CSSSelector::PseudoType CSSSelectorParser::ParsePseudoType(const AtomicString& name,
                                                            bool has_arguments,
                                                            const Document* document) {
   CSSSelector::PseudoType pseudo_type = CSSSelector::NameToPseudoType(name, has_arguments, document);
@@ -912,10 +912,10 @@ CSSSelector::PseudoType CSSSelectorParser::ParsePseudoType(const std::string& na
     return pseudo_type;
   }
 
-  if (name.compare(0, 8, "-webkit-") == 0) {
+  if (name.StartsWith("-webkit-")) {
     return CSSSelector::PseudoType::kPseudoWebKitCustomElement;
   }
-  if (name.compare(0, 10, "-internal-") == 0) {
+  if (name.StartsWith("-internal-")) {
     return CSSSelector::PseudoType::kPseudoBlinkInternalElement;
   }
   return CSSSelector::PseudoType::kPseudoUnknown;
@@ -949,7 +949,7 @@ PseudoId CSSSelectorParser::ParsePseudoElement(const std::string& selector_strin
       }
 
       CSSSelector::PseudoType pseudo_type =
-          ParsePseudoType(std::string(selector_name_token.Value()),
+          ParsePseudoType(AtomicString(selector_name_token.Value()),
                           /*has_arguments=*/false, parent ? &parent->GetDocument() : nullptr);
 
       PseudoId pseudo_id = CSSSelector::GetPseudoId(pseudo_type);
diff --git a/bridge/core/css/parser/css_selector_parser.h b/bridge/core/css/parser/css_selector_parser.h
index bc2323011..4eadd563a 100644
--- a/bridge/core/css/parser/css_selector_parser.h
+++ b/bridge/core/css/parser/css_selector_parser.h
@@ -58,7 +58,7 @@ class CSSSelectorParser {
   static bool SupportsComplexSelector(CSSParserTokenStream&,
                                       std::shared_ptr<const CSSParserContext>);
 
-  static CSSSelector::PseudoType ParsePseudoType(const std::string& name,
+  static CSSSelector::PseudoType ParsePseudoType(const AtomicString& name,
                                                  bool has_arguments,
                                                  const Document*);
 
diff --git a/bridge/foundation/atomic_string.h b/bridge/foundation/atomic_string.h
index 9c1d29bd5..e7ec5db9c 100644
--- a/bridge/foundation/atomic_string.h
+++ b/bridge/foundation/atomic_string.h
@@ -64,7 +64,7 @@ class AtomicString {
 
   const char* Characters8() const;
   const char16_t* Characters16() const;
-  std::string GetString() const { return string_->Characters8(); }
+  std::string GetString() const { return std::string(string_->Characters8(), string_->length()); }
 
   AtomicString RemoveCharacters(CharacterMatchFunctionPtr);
 
@@ -85,6 +85,12 @@ class AtomicString {
     return string_->Find(match_function, start);
   }
 
+  bool StartsWith(
+      const std::string_view& prefix,
+      TextCaseSensitivity case_sensitivity = kTextCaseSensitive) const {
+    return string_->StartsWith(prefix);
+  }
+
   inline bool ContainsOnlyLatin1OrEmpty() const {
     if (empty())
       return true;
diff --git a/bridge/foundation/string_impl.cc b/bridge/foundation/string_impl.cc
index e561a7bf9..0be2ff909 100644
--- a/bridge/foundation/string_impl.cc
+++ b/bridge/foundation/string_impl.cc
@@ -14,6 +14,25 @@ namespace webf {
 DEFINE_GLOBAL(StringImpl, g_global_empty);
 DEFINE_GLOBAL(StringImpl, g_global_empty16_bit);
 
+ALWAYS_INLINE bool Equal(const char* a, const char16_t* b, size_t length) {
+  for (size_t i = 0; i < length; ++i) {
+    if (a[i] != b[i])
+      return false;
+  }
+  return true;
+}
+
+ALWAYS_INLINE bool Equal(const char16_t* a, const char* b, size_t length) {
+  return Equal(b, a, length);
+}
+
+template <typename CharType>
+ALWAYS_INLINE bool Equal(const CharType* a,
+                         const CharType* b,
+                         size_t length) {
+  return std::equal(a, a + length, b);
+}
+
 // Callers need the global empty strings to be non-const.
 StringImpl* StringImpl::empty_ = const_cast<StringImpl*>(&g_global_empty);
 StringImpl* StringImpl::empty16_bit_ =
@@ -154,6 +173,19 @@ size_t StringImpl::Find(CharacterMatchFunctionPtr match_function,
   return internal::Find(Characters16(), length_, match_function, start);
 }
 
+bool StringImpl::StartsWith(char character) const {
+  return length_ && (*this)[0] == character;
+}
+
+bool StringImpl::StartsWith(const std::string_view& prefix) const {
+  if (prefix.length() > length())
+    return false;
+  if (Is8Bit()) {
+    return Equal(Characters8(), prefix.data(), prefix.length());
+  }
+  return Equal(Characters16(), prefix.data(), prefix.length());
+}
+
 std::shared_ptr<StringImpl> StringImpl::Substring(size_t start,
                                                   size_t length) const {
   if (start >= length_)
diff --git a/bridge/foundation/string_impl.h b/bridge/foundation/string_impl.h
index 45b4ff579..7085738c2 100644
--- a/bridge/foundation/string_impl.h
+++ b/bridge/foundation/string_impl.h
@@ -128,10 +128,10 @@ class StringImpl : public std::enable_shared_from_this<StringImpl> {
   static StringImpl* empty_;
   static StringImpl* empty16_bit_;
 
-  FORCE_INLINE static std::shared_ptr<StringImpl> empty_shared() {
+  ALWAYS_INLINE static std::shared_ptr<StringImpl> empty_shared() {
     return std::shared_ptr<StringImpl>(empty_, [](StringImpl*) {});
   }
-  FORCE_INLINE static std::shared_ptr<StringImpl> empty16_shared() {
+  ALWAYS_INLINE static std::shared_ptr<StringImpl> empty16_shared() {
     return std::shared_ptr<StringImpl>(empty16_bit_, [](StringImpl*) {});
   }
 
@@ -209,6 +209,9 @@ class StringImpl : public std::enable_shared_from_this<StringImpl> {
   //  size_t Find(base::RepeatingCallback<bool(UChar)> match_callback,
   //                  wtf_size_t index = 0) const;
 
+  bool StartsWith(char) const;
+  bool StartsWith(const std::string_view&) const;
+
   std::shared_ptr<StringImpl> Substring(size_t pos, size_t len = UINT_MAX) const;
 
   // The high bits of 'hash' are always empty, but we prefer to store our