(TRINIDAD-2557)
writeDoctype is not implemented in PPRResponseWriter
diff --git a/trinidad-impl/src/main/java/org/apache/myfaces/trinidadinternal/renderkit/core/ppr/PPRResponseWriter.java b/trinidad-impl/src/main/java/org/apache/myfaces/trinidadinternal/renderkit/core/ppr/PPRResponseWriter.java
index d2efd66..47df154 100644
--- a/trinidad-impl/src/main/java/org/apache/myfaces/trinidadinternal/renderkit/core/ppr/PPRResponseWriter.java
+++ b/trinidad-impl/src/main/java/org/apache/myfaces/trinidadinternal/renderkit/core/ppr/PPRResponseWriter.java
@@ -220,6 +220,13 @@
   }
 
   @Override
+  public void writeDoctype(String doctype) throws IOException {
+    if (_isInsideTarget()) {
+      super.writeDoctype(doctype);
+    }
+  }
+
+  @Override
   public void writeText(Object      text,
                         UIComponent component,
                         String      propertyName) throws IOException