diff --git a/ph-css/src/main/java/com/helger/css/decl/CSSSelectorMemberHost.java b/ph-css/src/main/java/com/helger/css/decl/CSSSelectorMemberHost.java
new file mode 100644
index 00000000..78ed46d3
--- /dev/null
+++ b/ph-css/src/main/java/com/helger/css/decl/CSSSelectorMemberHost.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2014-2022 Philip Helger (www.helger.com)
+ * philip[at]helger[dot]com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.helger.css.decl;
+
+import javax.annotation.Nonnegative;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.NotThreadSafe;
+
+import com.helger.commons.ValueEnforcer;
+import com.helger.commons.annotation.Nonempty;
+import com.helger.commons.annotation.ReturnsMutableCopy;
+import com.helger.commons.collection.impl.CommonsArrayList;
+import com.helger.commons.collection.impl.ICommonsList;
+import com.helger.commons.hashcode.HashCodeGenerator;
+import com.helger.commons.state.EChange;
+import com.helger.commons.string.ToStringGenerator;
+import com.helger.css.CSSSourceLocation;
+import com.helger.css.ECSSVersion;
+import com.helger.css.ICSSSourceLocationAware;
+import com.helger.css.ICSSVersionAware;
+import com.helger.css.ICSSWriterSettings;
+
+/**
+ * Represents a single, simple CSS selector as used for the ":host()" CSS pseudo class function.<br>
+ * Note: this class was completely redesigned for version 3.7.4
+ *
+ * @author Philip Helger
+ */
+@NotThreadSafe
+public class CSSSelectorMemberHost implements ICSSSelectorMember, ICSSVersionAware, ICSSSourceLocationAware
+{
+  private final ICSSSelectorMember m_aSimpleSelector;
+  private CSSSourceLocation m_aSourceLocation;
+
+  public CSSSelectorMemberHost (@Nonnull final ICSSSelectorMember aSimpleSelector)
+  {
+    ValueEnforcer.notNull (aSimpleSelector, "SimpleSelector");
+    m_aSimpleSelector = aSimpleSelector;
+  }
+
+  @Nonnull
+  public ICSSSelectorMember getSimpleSelector ()
+  {
+    return m_aSimpleSelector;
+  }
+
+  @Nonnull
+  @Nonempty
+  public String getAsCSSString (@Nonnull final ICSSWriterSettings aSettings, @Nonnegative final int nIndentLevel)
+  {
+    aSettings.checkVersionRequirements (this);
+
+    final StringBuilder aSB = new StringBuilder (":host(");
+    aSB.append (m_aSimpleSelector.getAsCSSString (aSettings, 0));
+    return aSB.append (')').toString ();
+  }
+
+  @Nonnull
+  public ECSSVersion getMinimumCSSVersion ()
+  {
+    return ECSSVersion.CSS30;
+  }
+
+  public void setSourceLocation (@Nullable final CSSSourceLocation aSourceLocation)
+  {
+    m_aSourceLocation = aSourceLocation;
+  }
+
+  @Nullable
+  public CSSSourceLocation getSourceLocation ()
+  {
+    return m_aSourceLocation;
+  }
+
+  @Override
+  public boolean equals (final Object o)
+  {
+    if (o == this)
+      return true;
+    if (o == null || !getClass ().equals (o.getClass ()))
+      return false;
+    final CSSSelectorMemberHost rhs = (CSSSelectorMemberHost) o;
+    return m_aSimpleSelector.equals (rhs.m_aSimpleSelector);
+  }
+
+  @Override
+  public int hashCode ()
+  {
+    return new HashCodeGenerator (this).append (m_aSimpleSelector).getHashCode ();
+  }
+
+  @Override
+  public String toString ()
+  {
+    return new ToStringGenerator (null).append ("simpleSelector", m_aSimpleSelector)
+                                       .appendIfNotNull ("sourceLocation", m_aSourceLocation)
+                                       .getToString ();
+  }
+}
diff --git a/ph-css/src/main/java/com/helger/css/decl/CSSSelectorMemberSlotted.java b/ph-css/src/main/java/com/helger/css/decl/CSSSelectorMemberSlotted.java
new file mode 100644
index 00000000..fa7f7734
--- /dev/null
+++ b/ph-css/src/main/java/com/helger/css/decl/CSSSelectorMemberSlotted.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2014-2022 Philip Helger (www.helger.com)
+ * philip[at]helger[dot]com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.helger.css.decl;
+
+import javax.annotation.Nonnegative;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.NotThreadSafe;
+
+import com.helger.commons.ValueEnforcer;
+import com.helger.commons.annotation.Nonempty;
+import com.helger.commons.annotation.ReturnsMutableCopy;
+import com.helger.commons.collection.impl.CommonsArrayList;
+import com.helger.commons.collection.impl.ICommonsList;
+import com.helger.commons.hashcode.HashCodeGenerator;
+import com.helger.commons.state.EChange;
+import com.helger.commons.string.ToStringGenerator;
+import com.helger.css.CSSSourceLocation;
+import com.helger.css.ECSSVersion;
+import com.helger.css.ICSSSourceLocationAware;
+import com.helger.css.ICSSVersionAware;
+import com.helger.css.ICSSWriterSettings;
+
+/**
+ * Represents a single, simple CSS selector as used for the "::slotted()" CSS pseudo element.<br>
+ * Note: this class was completely redesigned for version 3.7.4
+ *
+ * @author Philip Helger
+ */
+@NotThreadSafe
+public class CSSSelectorMemberSlotted implements ICSSSelectorMember, ICSSVersionAware, ICSSSourceLocationAware
+{
+  private final ICSSSelectorMember m_aSimpleSelector;
+  private CSSSourceLocation m_aSourceLocation;
+
+  public CSSSelectorMemberSlotted (@Nonnull final ICSSSelectorMember aSimpleSelector)
+  {
+    ValueEnforcer.notNull (aSimpleSelector, "SimpleSelector");
+    m_aSimpleSelector = aSimpleSelector;
+  }
+
+  @Nonnull
+  public ICSSSelectorMember getSimpleSelector ()
+  {
+    return m_aSimpleSelector;
+  }
+
+  @Nonnull
+  @Nonempty
+  public String getAsCSSString (@Nonnull final ICSSWriterSettings aSettings, @Nonnegative final int nIndentLevel)
+  {
+    aSettings.checkVersionRequirements (this);
+
+    final StringBuilder aSB = new StringBuilder ("::slotted(");
+    aSB.append (m_aSimpleSelector.getAsCSSString (aSettings, 0));
+    return aSB.append (')').toString ();
+  }
+
+  @Nonnull
+  public ECSSVersion getMinimumCSSVersion ()
+  {
+    return ECSSVersion.CSS30;
+  }
+
+  public void setSourceLocation (@Nullable final CSSSourceLocation aSourceLocation)
+  {
+    m_aSourceLocation = aSourceLocation;
+  }
+
+  @Nullable
+  public CSSSourceLocation getSourceLocation ()
+  {
+    return m_aSourceLocation;
+  }
+
+  @Override
+  public boolean equals (final Object o)
+  {
+    if (o == this)
+      return true;
+    if (o == null || !getClass ().equals (o.getClass ()))
+      return false;
+    final CSSSelectorMemberSlotted rhs = (CSSSelectorMemberSlotted) o;
+    return m_aSimpleSelector.equals (rhs.m_aSimpleSelector);
+  }
+
+  @Override
+  public int hashCode ()
+  {
+    return new HashCodeGenerator (this).append (m_aSimpleSelector).getHashCode ();
+  }
+
+  @Override
+  public String toString ()
+  {
+    return new ToStringGenerator (null).append ("simpleSelector", m_aSimpleSelector)
+                                       .appendIfNotNull ("sourceLocation", m_aSourceLocation)
+                                       .getToString ();
+  }
+}
diff --git a/ph-css/src/main/java/com/helger/css/handler/CSSNodeToDomainObject.java b/ph-css/src/main/java/com/helger/css/handler/CSSNodeToDomainObject.java
index b0e6562a..2b014500 100644
--- a/ph-css/src/main/java/com/helger/css/handler/CSSNodeToDomainObject.java
+++ b/ph-css/src/main/java/com/helger/css/handler/CSSNodeToDomainObject.java
@@ -267,6 +267,23 @@ private ICSSSelectorMember _createSelectorMember (final CSSNode aNode)
           return ret;
         }
 
+        if (ECSSNodeType.HOST.isNode(aChildNode, m_eVersion))
+        {
+          final ICSSSelectorMember aMember = _createSelectorMember (aChildNode.jjtGetChild(0));
+          final CSSSelectorMemberHost ret = new CSSSelectorMemberHost(aMember);
+          if (m_bUseSourceLocation)
+            ret.setSourceLocation (aNode.getSourceLocation ());
+          return ret;
+        }
+
+        if (ECSSNodeType.SLOTTED.isNode(aChildNode, m_eVersion)) {
+          final ICSSSelectorMember aMember = _createSelectorMember (aChildNode.jjtGetChild(0));
+          final CSSSelectorMemberSlotted ret = new CSSSelectorMemberSlotted(aMember);
+          if (m_bUseSourceLocation)
+            ret.setSourceLocation (aNode.getSourceLocation ());
+          return ret;
+        }
+
         // It's a function (e.g. ":lang(fr)")
         final CSSExpression aExpr = _createExpression (aChildNode);
         final CSSSelectorMemberFunctionLike ret = new CSSSelectorMemberFunctionLike (aNode.getText (), aExpr);
diff --git a/ph-css/src/main/java/com/helger/css/handler/ECSSNodeType.java b/ph-css/src/main/java/com/helger/css/handler/ECSSNodeType.java
index 28626351..a3ed72f2 100644
--- a/ph-css/src/main/java/com/helger/css/handler/ECSSNodeType.java
+++ b/ph-css/src/main/java/com/helger/css/handler/ECSSNodeType.java
@@ -57,6 +57,8 @@ public enum ECSSNodeType
   HASH (ParserCSS30TreeConstants.JJTHASH),
   CLASS (ParserCSS30TreeConstants.JJTCLASS),
   PSEUDO (ParserCSS30TreeConstants.JJTPSEUDO),
+  HOST (ParserCSS30TreeConstants.JJTHOST),
+  SLOTTED (ParserCSS30TreeConstants.JJTSLOTTED),
   NEGATION (ParserCSS30TreeConstants.JJTNEGATION),
   ATTRIB (ParserCSS30TreeConstants.JJTATTRIB),
   ATTRIBOPERATOR (ParserCSS30TreeConstants.JJTATTRIBOPERATOR),
diff --git a/ph-css/src/main/jjtree/ParserCSS30.jjt b/ph-css/src/main/jjtree/ParserCSS30.jjt
index e398e826..50141a21 100644
--- a/ph-css/src/main/jjtree/ParserCSS30.jjt
+++ b/ph-css/src/main/jjtree/ParserCSS30.jjt
@@ -300,6 +300,8 @@ TOKEN :
 | < FUNCTION_CALC: "calc("
                  | "-" <IDENT> "-calc(" >
 | < FUNCTION_NOT: ":not(" >
+| < FUNCTION_HOST: "host(" >
+| < FUNCTION_SLOTTED: "slotted(" >
 | < FUNCTION_NTH: "nth-child("
                 | "nth-last-child("
                 | "nth-of-type("
@@ -765,9 +767,9 @@ void mathSum() #void : {}
 {
   mathProduct()
   ( LOOKAHEAD(2)
-    <S>
+    ( <S> )*
     mathSumOperator()
-    <S>
+    ( <S> )*
     mathProduct ()
   )*
 }
@@ -1006,6 +1008,18 @@ void pseudoNth () #nth :
   ( <S> )*
 }
 
+void pseudoHost () #host : {}
+{
+  ( <S> )*
+  ( simpleSelectorSequence () )?
+}
+
+void pseudoSlotted () #slotted : {}
+{
+  ( <S> )*
+  ( simpleSelectorSequence () )?
+}
+
 void pseudo() : {}
 {
   <COLON> { jjtThis.setText (":"); }
@@ -1014,6 +1028,12 @@ void pseudo() : {}
   ( <FUNCTION_NTH> { jjtThis.appendText (token.image); }
     pseudoNth()
     <RROUND>  // do not append because of expression!
+  | <FUNCTION_HOST> { jjtThis.appendText (token.image); }
+    pseudoHost()
+    <RROUND> // do not append because of expression!
+  | <FUNCTION_SLOTTED> { jjtThis.appendText (token.image); }
+    pseudoSlotted()
+    <RROUND> // do not append because of expression!
   | LOOKAHEAD( <FUNCTION> )
     <FUNCTION> { jjtThis.appendText (token.image); }
     ( <S> )*