diff --git a/Documentation/doc/resources/1.8.13/cgal_stylesheet.css b/Documentation/doc/resources/1.8.13/cgal_stylesheet.css
index ea5b102c0b8..ab870f9aa05 100644
--- a/Documentation/doc/resources/1.8.13/cgal_stylesheet.css
+++ b/Documentation/doc/resources/1.8.13/cgal_stylesheet.css
@@ -356,6 +356,7 @@ div.summary
   text-align: left;
   outline: none;
   font: 14px Roboto,sans-serif;
+  user-select: auto;
 }
 
 .active, .collapsible:hover {
diff --git a/Documentation/doc/resources/1.8.14/cgal_stylesheet.css b/Documentation/doc/resources/1.8.14/cgal_stylesheet.css
index 110cf066bcb..71fe3a10aff 100644
--- a/Documentation/doc/resources/1.8.14/cgal_stylesheet.css
+++ b/Documentation/doc/resources/1.8.14/cgal_stylesheet.css
@@ -356,6 +356,7 @@ div.summary
   text-align: left;
   outline: none;
   font: 14px Roboto,sans-serif;
+  user-select: auto;
 }
 
 .active, .collapsible:hover {
diff --git a/Documentation/doc/resources/1.8.20/cgal_stylesheet.css b/Documentation/doc/resources/1.8.20/cgal_stylesheet.css
index 110cf066bcb..71fe3a10aff 100644
--- a/Documentation/doc/resources/1.8.20/cgal_stylesheet.css
+++ b/Documentation/doc/resources/1.8.20/cgal_stylesheet.css
@@ -356,6 +356,7 @@ div.summary
   text-align: left;
   outline: none;
   font: 14px Roboto,sans-serif;
+  user-select: auto;
 }
 
 .active, .collapsible:hover {
diff --git a/Documentation/doc/resources/1.8.4/cgal_stylesheet.css b/Documentation/doc/resources/1.8.4/cgal_stylesheet.css
index 903855d3625..175ded2d604 100644
--- a/Documentation/doc/resources/1.8.4/cgal_stylesheet.css
+++ b/Documentation/doc/resources/1.8.4/cgal_stylesheet.css
@@ -347,6 +347,7 @@ div.summary
   text-align: left;
   outline: none;
   font: 14px Roboto,sans-serif;
+  user-select: auto;
 }
 
 .active, .collapsible:hover {
diff --git a/Documentation/doc/resources/1.9.3/cgal_stylesheet.css b/Documentation/doc/resources/1.9.3/cgal_stylesheet.css
index 110cf066bcb..71fe3a10aff 100644
--- a/Documentation/doc/resources/1.9.3/cgal_stylesheet.css
+++ b/Documentation/doc/resources/1.9.3/cgal_stylesheet.css
@@ -356,6 +356,7 @@ div.summary
   text-align: left;
   outline: none;
   font: 14px Roboto,sans-serif;
+  user-select: auto;
 }
 
 .active, .collapsible:hover {