diff --git a/ph-css/src/main/java/com/helger/css/ECSSUnit.java b/ph-css/src/main/java/com/helger/css/ECSSUnit.java
index a65d90ac..aa1f52e5 100644
--- a/ph-css/src/main/java/com/helger/css/ECSSUnit.java
+++ b/ph-css/src/main/java/com/helger/css/ECSSUnit.java
@@ -88,6 +88,10 @@ public enum ECSSUnit implements IHasName
   VMIN ("vmin", ECSSMetaUnit.VIEWPORT_RELATIVE_LENGTH),
   /** Equal to the larger of 'vw' or 'vh'. */
   VMAX ("vmax", ECSSMetaUnit.VIEWPORT_RELATIVE_LENGTH),
+  /** Equal to 1% of the width of the dynamic viewport. */
+  DVW ("dvw", ECSSMetaUnit.VIEWPORT_RELATIVE_LENGTH),
+  /** Equal to 1% of the height of the dynamic viewport. */
+  DVH ("dvh", ECSSMetaUnit.VIEWPORT_RELATIVE_LENGTH),
 
   /** Represents a percentage of the width of the query container. */
   CQW ("cqw", ECSSMetaUnit.CONTAINER_RELATIVE_LENGTH),
@@ -566,6 +570,84 @@ public static String vmax (@NonNull final BigDecimal aValue)
     return VMAX.format (aValue);
   }
 
+  /**
+   * @param nValue
+   *        value to format
+   * @return <code>value + "dvw"</code>
+   * @since 8.1.1
+   */
+  @NonNull
+  @Nonempty
+  public static String dvw (final int nValue)
+  {
+    return DVW.format (nValue);
+  }
+
+  /**
+   * @param dValue
+   *        value to format
+   * @return <code>value + "dvw"</code>
+   * @since 8.1.1
+   */
+  @NonNull
+  @Nonempty
+  public static String dvw (final double dValue)
+  {
+    return DVW.format (dValue);
+  }
+
+  /**
+   * @param aValue
+   *        Value to format. May not be <code>null</code>.
+   * @return <code>value + "dvw"</code>
+   * @since 8.1.1
+   */
+  @NonNull
+  @Nonempty
+  public static String dvw (@NonNull final BigDecimal aValue)
+  {
+    return DVW.format (aValue);
+  }
+
+  /**
+   * @param nValue
+   *        value to format
+   * @return <code>value + "dvh"</code>
+   * @since 8.1.1
+   */
+  @NonNull
+  @Nonempty
+  public static String dvh (final int nValue)
+  {
+    return DVH.format (nValue);
+  }
+
+  /**
+   * @param dValue
+   *        value to format
+   * @return <code>value + "dvh"</code>
+   * @since 8.1.1
+   */
+  @NonNull
+  @Nonempty
+  public static String dvh (final double dValue)
+  {
+    return DVH.format (dValue);
+  }
+
+  /**
+   * @param aValue
+   *        Value to format. May not be <code>null</code>.
+   * @return <code>value + "dvh"</code>
+   * @since 8.1.1
+   */
+  @NonNull
+  @Nonempty
+  public static String dvh (@NonNull final BigDecimal aValue)
+  {
+    return DVH.format (aValue);
+  }
+
   /**
    * @param nValue
    *        value to format