diff --git a/theme/boost/templates/columns1.mustache b/theme/boost/templates/columns1.mustache
index d2965a73b71..5285d6213d6 100644
--- a/theme/boost/templates/columns1.mustache
+++ b/theme/boost/templates/columns1.mustache
@@ -48,7 +48,7 @@
     <div id="page" class="container-fluid d-print-block">
         <div id="page-content" class="row pb-3 d-print-block">
             <div id="region-main-box" class="col-12">
-                <section id="region-main" aria-label="{{#str}}content{{/str}}">
+                <div id="region-main">
                     {{{ output.course_content_header }}}
                     {{#headercontent}}
                         {{> core/activity_header }}
@@ -56,7 +56,7 @@
                     {{{ output.main_content }}}
                     {{{ output.activity_navigation }}}
                     {{{ output.course_content_footer }}}
-                </section>
+                </div>
             </div>
         </div>
     </div>
diff --git a/theme/boost/templates/columns2.mustache b/theme/boost/templates/columns2.mustache
index 463f5e55f6d..a5f3db4f938 100644
--- a/theme/boost/templates/columns2.mustache
+++ b/theme/boost/templates/columns2.mustache
@@ -73,7 +73,7 @@
                     <div> {{{ regionmainsettingsmenu }}} </div>
                 </div>
                 {{/hasregionmainsettingsmenu}}
-                <section id="region-main" {{#hasblocks}}class="has-blocks mb-3"{{/hasblocks}} aria-label="{{#str}}content{{/str}}">
+                <div id="region-main" {{#hasblocks}}class="has-blocks mb-3"{{/hasblocks}}>
 
                     {{#hasregionmainsettingsmenu}}
                         <div class="region_main_settings_menu_proxy"></div>
@@ -89,7 +89,7 @@
                     {{{ output.activity_navigation }}}
                     {{{ output.course_content_footer }}}
 
-                </section>
+                </div>
                 {{#hasblocks}}
                 <section data-region="blocks-column" class="d-print-none" aria-label="{{#str}}blocks{{/str}}">
                     {{{ addblockbutton }}}
diff --git a/theme/boost/templates/drawers.mustache b/theme/boost/templates/drawers.mustache
index 7918f2e6177..3056b034126 100644
--- a/theme/boost/templates/drawers.mustache
+++ b/theme/boost/templates/drawers.mustache
@@ -142,7 +142,7 @@
                         <div> {{{ regionmainsettingsmenu }}} </div>
                     </div>
                     {{/hasregionmainsettingsmenu}}
-                    <section id="region-main" aria-label="{{#str}}content{{/str}}">
+                    <div id="region-main">
 
                         {{#hasregionmainsettingsmenu}}
                             <div class="region_main_settings_menu_proxy"></div>
@@ -162,7 +162,7 @@
                         {{{ output.activity_navigation }}}
                         {{{ output.course_content_footer }}}
 
-                    </section>
+                    </div>
                 </div>
             </div>
         </div>
diff --git a/theme/boost/templates/login.mustache b/theme/boost/templates/login.mustache
index 48428fd2f61..9014343f524 100644
--- a/theme/boost/templates/login.mustache
+++ b/theme/boost/templates/login.mustache
@@ -41,13 +41,13 @@
     <div id="page" class="container-fluid pt-5 mt-0">
         <div id="page-content" class="row">
             <div id="region-main-box" class="col-12">
-                <section id="region-main" class="col-12 h-100" aria-label="{{#str}}content{{/str}}">
+                <div id="region-main" class="col-12 h-100">
                 <div class="login-wrapper">
                     <div class="login-container">
                     {{{ output.main_content }}}
                     </div>
                 </div>
-                </section>
+                </div>
             </div>
         </div>
     </div>
diff --git a/theme/boost/templates/maintenance.mustache b/theme/boost/templates/maintenance.mustache
index d3dc36eec2e..d952db3b778 100644
--- a/theme/boost/templates/maintenance.mustache
+++ b/theme/boost/templates/maintenance.mustache
@@ -57,9 +57,9 @@
         </div>
 
         <div id="page-content" class="row">
-            <section id="region-main" class="col-12" aria-label="{{#str}}content{{/str}}">
+            <div id="region-main" class="col-12">
                 {{{ output.main_content }}}
-            </section>
+            </div>
         </div>
 
     </div>
diff --git a/theme/boost/templates/secure.mustache b/theme/boost/templates/secure.mustache
index e5334304a3c..c35d11225b6 100644
--- a/theme/boost/templates/secure.mustache
+++ b/theme/boost/templates/secure.mustache
@@ -60,7 +60,7 @@
 
         <div id="page-content" class="row">
             <div id="region-main-box" class="col-12">
-                <section id="region-main" {{#hasblocks}}class="has-blocks"{{/hasblocks}} aria-label="{{#str}}content{{/str}}">
+                <div id="region-main" {{#hasblocks}}class="has-blocks"{{/hasblocks}}>
 
                     {{{ output.course_content_header }}}
                     {{#headercontent}}
@@ -69,7 +69,7 @@
                     {{{ output.main_content }}}
                     {{{ output.course_content_footer }}}
 
-                </section>
+                </div>
                 {{#hasblocks}}
                 <section data-region="blocks-column" aria-label="{{#str}}blocks{{/str}}">
                     {{{ sidepreblocks }}}
diff --git a/theme/classic/templates/columns.mustache b/theme/classic/templates/columns.mustache
index 36b54558b05..2fdfa234fb3 100644
--- a/theme/classic/templates/columns.mustache
+++ b/theme/classic/templates/columns.mustache
@@ -66,7 +66,7 @@
                     <div> {{{ output.region_main_settings_menu }}} </div>
                 </div>
                 {{/hasregionmainsettingsmenu}}
-                <section id="region-main" class="region-main-content" aria-label="{{#str}}content{{/str}}">
+                <div id="region-main" class="region-main-content">
                     {{#hasregionmainsettingsmenu}}
                         <div class="region_main_settings_menu_proxy"></div>
                     {{/hasregionmainsettingsmenu}}
@@ -77,7 +77,7 @@
                     {{{ output.main_content }}}
                     {{{ output.activity_navigation }}}
                     {{{ output.course_content_footer }}}
-                </section>
+                </div>
             </div>
             <div class="columnleft blockcolumn {{#haspreblocks}} has-blocks {{/haspreblocks}}">
                 <section data-region="blocks-column" class="d-print-none" aria-label="{{#str}}blocks{{/str}}">
diff --git a/theme/classic/templates/contentonly.mustache b/theme/classic/templates/contentonly.mustache
index b4045d64225..5efb2aa1c7d 100644
--- a/theme/classic/templates/contentonly.mustache
+++ b/theme/classic/templates/contentonly.mustache
@@ -54,7 +54,7 @@
     <div id="page" class="container-fluid">
         <div id="page-content" class="row">
             <div id="region-main-box" class="col-12">
-                <section id="region-main" aria-label="{{#str}}content{{/str}}">
+                <div id="region-main">
                     {{{ output.course_content_header }}}
                     {{#headercontent}}
                         {{> core/activity_header }}
@@ -62,7 +62,7 @@
                     {{{ output.main_content }}}
                     {{{ output.activity_navigation }}}
                     {{{ output.course_content_footer }}}
-                </section>
+                </div>
             </div>
         </div>
     </div>
diff --git a/theme/classic/templates/secure.mustache b/theme/classic/templates/secure.mustache
index 37b539dd0f2..74aaaa93913 100644
--- a/theme/classic/templates/secure.mustache
+++ b/theme/classic/templates/secure.mustache
@@ -71,7 +71,7 @@
 
         <div id="page-content" class="row {{#haspreblocks}} blocks-pre {{/haspreblocks}} {{#haspostblocks}} blocks-post {{/haspostblocks}}">
             <div id="region-main-box" class="region-main">
-                <section id="region-main" aria-label="{{#str}}content{{/str}}">
+                <div id="region-main">
                     <div class="card">
                         <div class="card-body">
                             {{{ output.course_content_header }}}
@@ -82,7 +82,7 @@
                             {{{ output.course_content_footer }}}
                         </div>
                     </div>
-                </section>
+                </div>
             </div>
             <div class="columnleft {{#haspreblocks}} has-blocks {{/haspreblocks}}">
                 <section data-region="blocks-column" class="d-print-none" aria-label="{{#str}}blocks{{/str}}">