diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/about.html b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/about.html
index 164f781a8fd..ea801d76621 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/about.html
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/about.html
@@ -1,8 +1,7 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
 <head>
-<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>About</title>
 </head>
 <body lang="EN-US">
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_repositorytasks.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_repositorytasks.htm
index c54fc445f78..b1055696bab 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_repositorytasks.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_repositorytasks.htm
@@ -1,13 +1,12 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2009, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Style-Type" content="text/css" />
+    "Copyright (c) IBM Corporation and others 2009, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Style-Type" content="text/css">
     <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <title>
       Ant tasks for managing repositories
     </title>
@@ -238,7 +237,7 @@ <h1>
     </table>
     <h2>
       Ant Tasks
-    </h2><br />
+    </h2><br>
     <table cellspacing="1" cellpadding="2" width="95%" align="center">
       <tr>
         <td>
@@ -436,7 +435,7 @@ <h3 class="c2">
                             properties that the artifact descriptor must have.
                           </td>
                         </tr>
-                      </table><br />
+                      </table><br>
                       Example: Exclude all pack.gz artifacts:
                       <pre>
     &lt;exclude&gt;
@@ -597,7 +596,7 @@ <h3 class="c2">
           </table>
         </td>
       </tr>
-    </table><br />
+    </table><br>
     Examples:
     <p>
 
@@ -729,7 +728,7 @@ <h3 class="c2">
           </table>
         </td>
       </tr>
-    </table><br />
+    </table><br>
     <table cellspacing="1" cellpadding="2" width="95%" align="center">
       <tr>
         <td>
@@ -872,7 +871,7 @@ <h3 class="c2">p2.process.artifacts</h3>
           </table>
         </td>
       </tr>
-    </table><br />
+    </table><br>
     <table cellspacing="1" cellpadding="2" width="95%" align="center">
       <tr>
         <td>
@@ -925,7 +924,7 @@ <h3 class="c2">p2.remove.iu</h3>
 
         </td>
       </tr>
-    </table><br />
+    </table><br>
     <table cellspacing="1" cellpadding="2" width="95%" align="center">
       <tr>
         <td>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_uipolicy.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_uipolicy.htm
index f5301cb54cd..17b65aba90e 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_uipolicy.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/p2_uipolicy.htm
@@ -1,17 +1,16 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2008, 2016. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Style-Type" content="text/css" />
+    "Copyright (c) IBM Corporation and others 2008, 2016. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Style-Type" content="text/css">
     <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <title>
       Configuring the UI Policy
     </title>
-    <link rel="stylesheet" type="text/css" href="../book.css" />
+    <link rel="stylesheet" type="text/css" href="../book.css">
 
     <style type="text/css">
 /*<![CDATA[*/
@@ -239,7 +238,7 @@ <h3>
 
     <p>
       <img border="0" src="images/p2cloudinstall.png" alt=
-      "Example Install Wizard" />
+      "Example Install Wizard">
     </p>
     <h3>
       Example: Customizing the UI Queries
@@ -278,7 +277,7 @@ <h3>
 
     <p>
       <img border="0" src="images/p2allbundles.png" alt=
-      "Example Install Wizard showing all bundles in the repository" />
+      "Example Install Wizard showing all bundles in the repository">
     </p>
     <p>
       Likewise, the <b>Installed Software</b> page shows every bundle in the
@@ -287,7 +286,7 @@ <h3>
     </p>
     <p>
       <img border="0" src="images/p2allbundlesinstalled.png" alt=
-      "Example Installed Software page showing all bundles that are installed" />
+      "Example Installed Software page showing all bundles that are installed">
 
     </p>
     <p>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_cheatsheet_composite.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_cheatsheet_composite.htm
index 617e98eba35..63f8d70e24b 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_cheatsheet_composite.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_cheatsheet_composite.htm
@@ -1,13 +1,12 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Style-Type" content="text/css" />
+    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Style-Type" content="text/css">
     <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <script language="JavaScript" src=
     "PLUGINS_ROOT/org.eclipse.help/livehelp.js" type="text/javascript">
 </script>
@@ -222,18 +221,18 @@ <h3>
     <p>
       <a href=
       "../../org.eclipse.platform.doc.user/reference/ref-cheatsheets.htm">Working
-      with cheat sheets</a><br />
+      with cheat sheets</a><br>
       <a href=
       "../../org.eclipse.platform.doc.user/reference/ref-composite-cheatsheets.htm">
-      Working with composite cheat sheets</a><br />
-      <a href="ua_cheatsheet_simple.htm">Creating cheat sheets</a><br />
+      Working with composite cheat sheets</a><br>
+      <a href="ua_cheatsheet_simple.htm">Creating cheat sheets</a><br>
 
-      <a href="ua_cheatsheet_guidelines.htm">Authoring guidelines</a><br />
+      <a href="ua_cheatsheet_guidelines.htm">Authoring guidelines</a><br>
       <a href="ua_cheatsheet_composite_content.htm">Composite cheat sheet
-      content file specification</a><br />
+      content file specification</a><br>
       <a href=
       "../reference/extension-points/org_eclipse_ui_cheatsheets_cheatSheetContent.html">
-      org.eclipse.ui.cheatsheets.cheatSheetContent extension point</a><br />
+      org.eclipse.ui.cheatsheets.cheatSheetContent extension point</a><br>
     </p>
   </body>
 </html>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_extensions.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_extensions.htm
index 4b5b642a715..bac22178cdf 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_extensions.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_extensions.htm
@@ -1,13 +1,12 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Style-Type" content="text/css" />
+    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Style-Type" content="text/css">
     <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <script language="JavaScript" src=
     "PLUGINS_ROOT/org.eclipse.help/livehelp.js" type="text/javascript">
 </script>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_includes.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_includes.htm
index 1682b3dca7e..ee8150a605d 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_includes.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_dynamic_includes.htm
@@ -1,13 +1,12 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Style-Type" content="text/css" />
+    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Style-Type" content="text/css">
     <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <script language="JavaScript" src=
     "PLUGINS_ROOT/org.eclipse.help/livehelp.js" type="text/javascript">
 </script>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_abstract_scope.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_abstract_scope.htm
index 024bdc80ec9..41266d95163 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_abstract_scope.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_abstract_scope.htm
@@ -1,13 +1,12 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2010, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Style-Type" content="text/css" />
+    "Copyright (c) IBM Corporation and others 2010, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Style-Type" content="text/css">
     <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <script language="JavaScript" src=
     "PLUGINS_ROOT/org.eclipse.help/livehelp.js" type="text/javascript">
 </script>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_content_child_links.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_content_child_links.htm
index 40d2daf8370..90d8e91964f 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_content_child_links.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_content_child_links.htm
@@ -1,13 +1,12 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-    <meta http-equiv="Content-Style-Type" content="text/css" />
+    "Copyright (c) IBM Corporation and others 2000, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <meta http-equiv="Content-Style-Type" content="text/css">
     <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <title>
       Adding Child Links to Help Pages
     </title>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_setup_help_data.htm b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_setup_help_data.htm
index 97a632af447..30864050930 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_setup_help_data.htm
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/guide/ua_help_setup_help_data.htm
@@ -1,17 +1,16 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) IBM Corporation and others 2006, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    "Copyright (c) IBM Corporation and others 2006, 2011. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>
       Help Data
     </title>
     <link rel="stylesheet" href="../schema.css" charset="utf-8" type=
-    "text/css" />
+    "text/css">
     <link rel="stylesheet" href="../book.css" charset="utf-8" type=
-    "text/css" />
+    "text/css">
     <style type="text/css">
 /*<![CDATA[*/
     span.c3 {color: #008000}
@@ -54,8 +53,8 @@ <h6 class="CaptionFigColumn">
     <p class="">
 
       The extension data for Help.
-    </p><br />
-    <br />
+    </p><br>
+    <br>
     <p class="SchemaDtd">
       &lt;!ELEMENT <a name="e.tocOrder" id="e.tocOrder">tocOrder</a> (<a href=
       "#e.toc">toc</a> | <a href="#e.category">category</a>)*&gt;
@@ -67,8 +66,8 @@ <h6 class="CaptionFigColumn">
       the items listed is not available, it is ignored. If there are items
       available that are not listed and not hidden, they will be displayed
       after the ones listed here.
-    </p><br />
-    <br />
+    </p><br>
+    <br>
     <p class="SchemaDtd">
       &lt;!ELEMENT <a name="e.toc" id="e.toc">toc</a> EMPTY&gt;
 
@@ -83,7 +82,7 @@ <h6 class="CaptionFigColumn">
 
       A reference to a top-level table of contents (TOC) entry, also called a
       "book".
-    </p><br />
+    </p><br>
     <ul class="ConfigMarkupAttlistDesc">
       <li>
         <b>id</b> - The unique identifier for this book. For XML file TOC
@@ -94,7 +93,7 @@ <h6 class="CaptionFigColumn">
         originating <code>AbstractTocProvider</code>.
       </li>
 
-    </ul><br />
+    </ul><br>
     <p class="SchemaDtd">
       &lt;!ELEMENT <a name="e.category" id="e.category">category</a> EMPTY&gt;
     </p>
@@ -112,12 +111,12 @@ <h6 class="CaptionFigColumn">
       specifying a <code>category</code> attribute for the <code>toc</code>
 
       element in the <code>org.eclipse.help.toc</code> extension point.
-    </p><br />
+    </p><br>
     <ul class="ConfigMarkupAttlistDesc">
       <li>
         <b>id</b> - The unique id of the category.
       </li>
-    </ul><br />
+    </ul><br>
 
     <p class="SchemaDtd">
       &lt;!ELEMENT <a name="e.hidden" id="e.hidden">hidden</a> (<a href=
@@ -127,8 +126,8 @@ <h6 class="CaptionFigColumn">
 
     <p class="ConfigMarkupElementDesc">
       Contains a set of help items that should be hidden from the user.
-    </p><br />
-    <br />
+    </p><br>
+    <br>
     <p class="SchemaDtd">
       &lt;!ELEMENT <a name="e.index" id="e.index">index</a> EMPTY&gt;
     </p>
@@ -141,7 +140,7 @@ <h6 class="CaptionFigColumn">
     </p>
     <p class="ConfigMarkupElementDesc">
       A reference to a contribution of help index keywords.
-    </p><br />
+    </p><br>
 
     <ul class="ConfigMarkupAttlistDesc">
       <li>
@@ -153,7 +152,7 @@ <h6 class="CaptionFigColumn">
         originating <code>AbstractIndexProvider</code>.
       </li>
 
-    </ul><br />
+    </ul><br>
     <h6 class="CaptionFigColumn">
       Examples:
     </h6>
@@ -225,7 +224,7 @@ <h6 class="CaptionFigColumn">
     <code>org.eclipse.help</code>, including the default help implementation
     provided by Eclipse.
     <p class="SchemaCopyright">
-      Copyright (c) 2006, 2011 IBM Corporation and others.<br />
+      Copyright (c) 2006, 2011 IBM Corporation and others.<br>
       All rights reserved. This program and the accompanying materials are made
       available under the terms of the Eclipse Public License v1.0 which
       accompanies this distribution, and is available at <a href=
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/questions/index.html b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/questions/index.html
index 8e0bded2b8f..678f1e6cab9 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/questions/index.html
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/questions/index.html
@@ -1,10 +1,9 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
 <head>
-	<meta name="copyright" content="Copyright (c) IBM Corporation and others 2000, 2013. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
-   <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type="text/css"/>
+	<meta name="copyright" content="Copyright (c) IBM Corporation and others 2000, 2013. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+   <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type="text/css">
    <title>Platform questions index</title>
 </head>
 <body>
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/extension-points/index.html b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/extension-points/index.html
index bfab3ac15eb..4ca9a57e118 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/extension-points/index.html
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/extension-points/index.html
@@ -1,15 +1,14 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) 2000, 2016 IBM Corporation and others. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    "Copyright (c) 2000, 2016 IBM Corporation and others. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>
       Platform Extension Points
     </title>
     <link rel="STYLESHEET" href="../../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <style type="text/css">
 /*<![CDATA[*/
     :link { color: #0000FF }
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/services/index.html b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/services/index.html
index 89fec8bf2ec..06ed2604536 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/services/index.html
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/reference/services/index.html
@@ -1,15 +1,14 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
   <head>
     <meta name="copyright" content=
-    "Copyright (c) 2021 Red Hat Inc. Corporation and others. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
-    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    "Copyright (c) 2021 Red Hat Inc. Corporation and others. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>
       OSGi services used by Platform and open to extensibility
     </title>
     <link rel="STYLESHEET" href="../../book.css" charset="ISO-8859-1" type=
-    "text/css" />
+    "text/css">
     <style type="text/css">
 /*<![CDATA[*/
     :link { color: #0000FF }
diff --git a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/whatsNew/platform_isv_whatsnew.html b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/whatsNew/platform_isv_whatsnew.html
index 1a348d0fc2c..c8bb90ad861 100644
--- a/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/whatsNew/platform_isv_whatsnew.html
+++ b/eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/whatsNew/platform_isv_whatsnew.html
@@ -1,10 +1,10 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html lang="en">
 <head>
-  <meta name="copyright" content="Copyright (c) Eclipse contributors and others 2025. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page."/>
-  <meta http-equiv="Content-Language" content="en-us"/>
-  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
-  <link rel="STYLESHEET" href="../book.css" type="text/css"/>
+  <meta name="copyright" content="Copyright (c) Eclipse contributors and others 2025. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page.">
+  <meta http-equiv="Content-Language" content="en-us">
+  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+  <link rel="STYLESHEET" href="../book.css" type="text/css">
   <style type="text/css">
     body { max-width: 900px; font-family: sans-serif; }
   </style>
