diff --git a/tuto/4.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki b/tuto/4.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
index cb0c69ae..ae75bd0c 100644
--- a/tuto/4.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
+++ b/tuto/4.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
@@ -62,5 +62,5 @@ However, we recommend to use <<a_api project="js_of_ocaml"|module Lwt_js_events>
 
 * Type <<a_api project="tyxml"|type Html5_types.base_attrib>> (attributes available for every element)
 * signature <<a_api project="tyxml"|module Html5_sigs.T>> (Element attributes)
-* [[http://www.w3schools.com/html5/html5_reference.asp|Official w3 HTML5 elements reference]]
+* [[http://www.w3schools.com/html/default.asp|W3Schools HTML5 reference]] 
 * [[http://www.w3schools.com/html5/html5_ref_eventattributes.asp|Events attributes]]
diff --git a/tuto/4.1/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki b/tuto/4.1/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
index cb0c69ae..ae75bd0c 100644
--- a/tuto/4.1/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
+++ b/tuto/4.1/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
@@ -62,5 +62,5 @@ However, we recommend to use <<a_api project="js_of_ocaml"|module Lwt_js_events>
 
 * Type <<a_api project="tyxml"|type Html5_types.base_attrib>> (attributes available for every element)
 * signature <<a_api project="tyxml"|module Html5_sigs.T>> (Element attributes)
-* [[http://www.w3schools.com/html5/html5_reference.asp|Official w3 HTML5 elements reference]]
+* [[http://www.w3schools.com/html/default.asp|W3Schools HTML5 reference]] 
 * [[http://www.w3schools.com/html5/html5_ref_eventattributes.asp|Events attributes]]
diff --git a/tuto/4.2/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki b/tuto/4.2/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
index cb0c69ae..a4c969ec 100644
--- a/tuto/4.2/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
+++ b/tuto/4.2/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
@@ -62,5 +62,5 @@ However, we recommend to use <<a_api project="js_of_ocaml"|module Lwt_js_events>
 
 * Type <<a_api project="tyxml"|type Html5_types.base_attrib>> (attributes available for every element)
 * signature <<a_api project="tyxml"|module Html5_sigs.T>> (Element attributes)
-* [[http://www.w3schools.com/html5/html5_reference.asp|Official w3 HTML5 elements reference]]
+* [[http://www.w3schools.com/html/default.asp|W3Schools HTML5 reference]]
 * [[http://www.w3schools.com/html5/html5_ref_eventattributes.asp|Events attributes]]
diff --git a/tuto/5.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki b/tuto/5.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
index 067fa88e..6c923387 100644
--- a/tuto/5.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
+++ b/tuto/5.0/manual/src/how-to-set-and-id-classes-or-other-attributes-to-html-elements.wiki
@@ -63,5 +63,5 @@ However, we recommend to use <<a_api project="js_of_ocaml"|module Lwt_js_events>
 
 * Type <<a_api project="tyxml"|type Html5_types.base_attrib>> (attributes available for every element)
 * signature <<a_api project="tyxml"|module Html5_sigs.T>> (Element attributes)
-* [[http://www.w3schools.com/html5/html5_reference.asp|Official w3 HTML5 elements reference]]
+* [[http://www.w3schools.com/html/default.asp|W3Schools HTML5 reference]]
 * [[http://www.w3schools.com/html5/html5_ref_eventattributes.asp|Events attributes]]