diff --git a/src/pug/chapter01.pug b/src/pug/chapter01.pug
index d7cd14d02..dd572c1ef 100644
--- a/src/pug/chapter01.pug
+++ b/src/pug/chapter01.pug
@@ -80,7 +80,7 @@ block page-content
         .navigation
           a(href="chapter02.html").navigation__button.navigation__button--next 1 Document structure
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title Unnumbered <em>document</em> structure
         section.publications__overview
           +link('#', 'Download Chapter', 'link--green', 'link__label--outer')
diff --git a/src/pug/chapter02.pug b/src/pug/chapter02.pug
index dbfb1d243..b2283c708 100644
--- a/src/pug/chapter02.pug
+++ b/src/pug/chapter02.pug
@@ -133,7 +133,7 @@ block page-content
           a(href="chapter01.html").navigation__button.navigation__button--prev Unnumbered document structure
           a(href="chapter03.html").navigation__button.navigation__button--next 2 Markup
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 1 Document structure
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter03.pug b/src/pug/chapter03.pug
index 86d1b78ce..8f4ad8af3 100644
--- a/src/pug/chapter03.pug
+++ b/src/pug/chapter03.pug
@@ -78,7 +78,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 2 Markup
             p A. N. Other
         section.publications__overview
diff --git a/src/pug/chapter04.pug b/src/pug/chapter04.pug
index 63ba2a9d2..24c9a429d 100644
--- a/src/pug/chapter04.pug
+++ b/src/pug/chapter04.pug
@@ -73,7 +73,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 3 LaTeX specifics
         section.publication-detail
           +accordion
diff --git a/src/pug/chapter05.pug b/src/pug/chapter05.pug
index 1b35b3e5d..6ad2607a1 100644
--- a/src/pug/chapter05.pug
+++ b/src/pug/chapter05.pug
@@ -74,7 +74,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 4 References and indices
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter06.pug b/src/pug/chapter06.pug
index fb6518814..ff6b37e48 100644
--- a/src/pug/chapter06.pug
+++ b/src/pug/chapter06.pug
@@ -94,7 +94,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 5 Floating environments
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter07.pug b/src/pug/chapter07.pug
index 99d7f0c2a..c1a1009ba 100644
--- a/src/pug/chapter07.pug
+++ b/src/pug/chapter07.pug
@@ -80,7 +80,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 6 Formulas
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter08.pug b/src/pug/chapter08.pug
index b0203abe6..60a9c29a4 100644
--- a/src/pug/chapter08.pug
+++ b/src/pug/chapter08.pug
@@ -78,7 +78,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 7 A Facsimile of Giovanni Battista de Benedetti’s Diversarum speculationum mathematicarum, et physicarum liber (Turin 1585)
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter09.pug b/src/pug/chapter09.pug
index dc4048633..9b76422a0 100644
--- a/src/pug/chapter09.pug
+++ b/src/pug/chapter09.pug
@@ -78,7 +78,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 8 Transcription and Translation
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter10.pug b/src/pug/chapter10.pug
index f85d116a9..b6c210e4d 100644
--- a/src/pug/chapter10.pug
+++ b/src/pug/chapter10.pug
@@ -78,7 +78,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 9 Facsimile and Text (3. Kapitel des 1. Teils)
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter11.pug b/src/pug/chapter11.pug
index 4d11cc0b9..547d7a024 100644
--- a/src/pug/chapter11.pug
+++ b/src/pug/chapter11.pug
@@ -78,7 +78,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title 10 Letters
         section.publications__overview
           +accordion
diff --git a/src/pug/chapter12.pug b/src/pug/chapter12.pug
index df0e98d14..30a6513e4 100644
--- a/src/pug/chapter12.pug
+++ b/src/pug/chapter12.pug
@@ -77,7 +77,7 @@ block page-content
           |
           a(href="facsimilepageenhanced.html" title="Enhanced Facsimile page") █
         section.publications__titleauthor
-          .row(id='1')
+          .row(id='chaptertitle')
             h1.publication-detail__title References
         section.publications__overview
           +accordion