diff --git a/default.epub b/default.epub
index 1c042ff1e..afcf96a3e 100644
--- a/default.epub
+++ b/default.epub
@@ -28,13 +28,13 @@ $else$
 $endif$
 $endfor$
 $if(subtitle)$
-  <h1 class="subtitle">$subtitle$</h1>
+  <p class="subtitle">$subtitle$</p>
 $endif$
 $for(author)$
-  <h2 class="author">$author$</h2>
+  <p class="author">$author$</p>
 $endfor$
 $for(creator)$
-  <h2 class="$creator.role$">$creator.text$</h2>
+  <p class="$creator.role$">$creator.text$</p>
 $endfor$
 $if(publisher)$
   <p class="publisher">$publisher$</p>
diff --git a/default.epub3 b/default.epub3
index 0325d53eb..8a12e0fb3 100644
--- a/default.epub3
+++ b/default.epub3
@@ -33,13 +33,13 @@ $else$
 $endif$
 $endfor$
 $if(subtitle)$
-  <h1 class="subtitle">$subtitle$</h1>
+  <p class="subtitle">$subtitle$</p>
 $endif$
 $for(author)$
-  <h2 class="author">$author$</h2>
+  <p class="author">$author$</p>
 $endfor$
 $for(creator)$
-  <h2 class="$creator.role$">$creator.text$</h2>
+  <p class="$creator.role$">$creator.text$</p>
 $endfor$
 $if(publisher)$
   <p class="publisher">$publisher$</p>
diff --git a/default.revealjs b/default.revealjs
index db16168f9..e6d561292 100644
--- a/default.revealjs
+++ b/default.revealjs
@@ -63,13 +63,13 @@ $if(title)$
 <section>
   <h1 class="title">$title$</h1>
 $if(subtitle)$
-  <h1 class="subtitle">$subtitle$</h1>
+  <p class="subtitle">$subtitle$</p>
 $endif$
 $for(author)$
-  <h2 class="author">$author$</h2>
+  <p class="author">$author$</p>
 $endfor$
 $if(date)$
-  <h3 class="date">$date$</h3>
+  <p class="date">$date$</p>
 $endif$
 </section>
 $endif$
diff --git a/default.slidy b/default.slidy
index 5f83b40ca..cccf3537d 100644
--- a/default.slidy
+++ b/default.slidy
@@ -51,7 +51,7 @@ $if(title)$
 <div class="slide titlepage">
   <h1 class="title">$title$</h1>
 $if(subtitle)$
-  <h1 class="subtitle">$subtitle$</h1>
+  <p class="subtitle">$subtitle$</p>
 $endif$
 $if(author)$
   <p class="author">