--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDocletWriter.java	Tue Sep 18 21:46:17 2018 -0700
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDocletWriter.java	Wed Sep 19 12:14:53 2018 +0530
@@ -29,6 +29,7 @@
 import jdk.javadoc.internal.doclets.formats.html.markup.TableHeader;
 
 import java.util.*;
+import java.util.function.Supplier;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -2105,4 +2106,20 @@
     Script getMainBodyScript() {
         return mainBodyScript;
     }
+
+    /**
+     * Creates the HTML tag if the tag is supported by this specific HTML version
+     * otherwise return the Content instance provided by Supplier ifNotSupported.
+     * @param tag the HTML tag
+     * @param ifSupported create this instance if HTML tag is supported
+     * @param ifNotSupported create this instance if HTML tag is not supported
+     * @return
+     */
+    protected Content createTagIfAllowed(HtmlTag tag, Supplier<Content> ifSupported, Supplier<Content> ifNotSupported) {
+        if (configuration.allowTag(tag)) {
+            return ifSupported.get();
+        } else {
+            return ifNotSupported.get();
+        }
+    }
 }