diff --git a/lib/tablelib.php b/lib/tablelib.php
index b9b593a7ffa..7aab424dc6b 100644
--- a/lib/tablelib.php
+++ b/lib/tablelib.php
@@ -1143,6 +1143,12 @@ class flexible_table {
         foreach ($row as $index => $data) {
             $column = $colbyindex[$index];
 
+            $columnattributes = $this->columnsattributes[$column] ?? [];
+            if (isset($columnattributes['class'])) {
+                $this->column_class($column, $columnattributes['class']);
+                unset($columnattributes['class']);
+            }
+
             $attributes = [
                 'class' => "cell c{$index}" . $this->column_class[$column],
                 'id' => "{$rowid}_c{$index}",
@@ -1155,7 +1161,7 @@ class flexible_table {
                 $attributes['scope'] = 'row';
             }
 
-            $attributes += $this->columnsattributes[$column] ?? [];
+            $attributes += $columnattributes;
 
             if (empty($this->prefs['collapse'][$column])) {
                 if ($this->column_suppress[$column] && $suppresslastrow !== null && $suppresslastrow[$index] === $data) {
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 35fde2df642..d007f8a840a 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -74,6 +74,7 @@ information provided here is intended especially for developers.
   action in the modal body like ticking a checkbox or selecting an element.
 * Course module indentation has been recovered for course format using components via Move right/left feature.
   Course formats using components will be allowed to use one level indentation only.
+* The method `flexible_table::set_columnsattributes` now can be used with 'class' key to add custom classes to the DOM.
 
 === 4.1 ===
 
diff --git a/reportbuilder/classes/external/custom_report_exporter.php b/reportbuilder/classes/external/custom_report_exporter.php
index 9fb6f60e8ad..b3e9f9fb6c0 100644
--- a/reportbuilder/classes/external/custom_report_exporter.php
+++ b/reportbuilder/classes/external/custom_report_exporter.php
@@ -100,6 +100,7 @@ class custom_report_exporter extends persistent_exporter {
                 ],
                 'multiple' => true,
             ],
+            'classes' => ['type' => PARAM_TEXT],
             'editmode' => ['type' => PARAM_BOOL],
             'sidebarmenucards' => [
                 'type' => custom_report_column_cards_exporter::read_properties_definition(),
@@ -155,10 +156,16 @@ class custom_report_exporter extends persistent_exporter {
             if ($filterspresent) {
                 $filtersform = $this->generate_filters_form()->render();
             }
-            // Get the report attributes.
+
+            // Get the report classes and attributes.
+            $reportattributes = $report->get_attributes();
+            if (isset($reportattributes['class'])) {
+                $classes = $reportattributes['class'];
+                unset($reportattributes['class']);
+            }
             $attributes = array_map(static function($key, $value): array {
                 return ['name' => $key, 'value' => $value];
-            }, array_keys($report->get_attributes()), $report->get_attributes());
+            }, array_keys($reportattributes), $reportattributes);
         }
 
         // If we are editing we need all this information for the template.
@@ -186,6 +193,7 @@ class custom_report_exporter extends persistent_exporter {
             'filterspresent' => $filterspresent,
             'filtersform' => $filtersform,
             'attributes' => $attributes,
+            'classes' => $classes ?? '',
             'editmode' => $this->editmode,
             'javascript' => '',
         ] + $editordata;
diff --git a/reportbuilder/classes/external/system_report_exporter.php b/reportbuilder/classes/external/system_report_exporter.php
index cabfa2a5457..4a2e2854bec 100644
--- a/reportbuilder/classes/external/system_report_exporter.php
+++ b/reportbuilder/classes/external/system_report_exporter.php
@@ -77,6 +77,7 @@ class system_report_exporter extends persistent_exporter {
                 ],
                 'multiple' => true,
             ],
+            'classes' => ['type' => PARAM_TEXT],
         ];
     }
 
@@ -116,10 +117,15 @@ class system_report_exporter extends persistent_exporter {
             $filtersform->set_data_for_dynamic_submission();
         }
 
-        // Get the report attributes.
+        // Get the report classes and attributes.
+        $sourceattributes = $source->get_attributes();
+        if (isset($sourceattributes['class'])) {
+            $classes = $sourceattributes['class'];
+            unset($sourceattributes['class']);
+        }
         $attributes = array_map(static function($key, $value): array {
             return ['name' => $key, 'value' => $value];
-        }, array_keys($source->get_attributes()), $source->get_attributes());
+        }, array_keys($sourceattributes), $sourceattributes);
 
         return [
             'table' => $output->render($table),
@@ -128,6 +134,7 @@ class system_report_exporter extends persistent_exporter {
             'filtersapplied' => $source->get_applied_filter_count(),
             'filtersform' => $filterspresent ? $filtersform->render() : '',
             'attributes' => $attributes,
+            'classes' => $classes ?? '',
         ];
     }
 }
diff --git a/reportbuilder/templates/report.mustache b/reportbuilder/templates/report.mustache
index ff28539a42f..65be77cb595 100644
--- a/reportbuilder/templates/report.mustache
+++ b/reportbuilder/templates/report.mustache
@@ -34,7 +34,7 @@
         "filtersform": "form"
     }
 }}
-<div class="reportbuilder-report"
+<div class="reportbuilder-report {{classes}}"
         data-region="core_reportbuilder/report"
         data-report-id="{{id}}"
         data-report-type="{{type}}"