diff --git a/angular/lib/src/lib/accordion/accordion.component.ts b/angular/lib/src/lib/accordion/accordion.component.ts
index 5282fad734..eae17db3d1 100644
--- a/angular/lib/src/lib/accordion/accordion.component.ts
+++ b/angular/lib/src/lib/accordion/accordion.component.ts
@@ -18,7 +18,7 @@ import {
 	toSlotContextWidget,
 	useDirectiveForHost,
 } from '@agnos-ui/angular-headless';
-import {NgIf} from '@angular/common';
+import {NgIf, NgSwitch, NgSwitchCase, NgSwitchDefault, NgTemplateOutlet} from '@angular/common';
 import type {AfterContentChecked, AfterViewInit, OnChanges, Signal, SimpleChanges} from '@angular/core';
 import {
 	ChangeDetectionStrategy,
@@ -60,10 +60,65 @@ export class AccordionItemStructureDirective {
 @Component({
 	standalone: true,
 	changeDetection: ChangeDetectionStrategy.OnPush,
-	imports: [UseDirective, SlotDirective, NgIf, AccordionHeaderDirective, AccordionBodyDirective],
+	imports: [
+		UseDirective,
+		SlotDirective,
+		NgIf,
+		AccordionHeaderDirective,
+		AccordionBodyDirective,
+		NgSwitch,
+		NgSwitchCase,
+		NgSwitchDefault,
+		NgTemplateOutlet,
+	],
 	template: `
 		<ng-template #structure let-state="state" let-widget="widget">
-			<h2 class="accordion-header {{ state.itemHeaderClass }}">
+			<ng-container [ngSwitch]="state.itemHeadingTag">
+				<ng-container *ngSwitchCase="'h1'" [ngTemplateOutlet]="h1"></ng-container>
+				<ng-container *ngSwitchCase="'h2'" [ngTemplateOutlet]="h2"></ng-container>
+				<ng-container *ngSwitchCase="'h3'" [ngTemplateOutlet]="h3"></ng-container>
+				<ng-container *ngSwitchCase="'h4'" [ngTemplateOutlet]="h4"></ng-container>
+				<ng-container *ngSwitchCase="'h5'" [ngTemplateOutlet]="h5"></ng-container>
+				<ng-container *ngSwitchCase="'h6'" [ngTemplateOutlet]="h6"></ng-container>
+				<ng-container *ngSwitchDefault [ngTemplateOutlet]="h2"></ng-container>
+			</ng-container>
+
+			<ng-template #h1>
+				<h1 class="accordion-header {{ state.itemHeaderClass }}">
+					<ng-template [ngTemplateOutlet]="button"></ng-template>
+				</h1>
+			</ng-template>
+
+			<ng-template #h2>
+				<h2 class="accordion-header {{ state.itemHeaderClass }}">
+					<ng-template [ngTemplateOutlet]="button"></ng-template>
+				</h2>
+			</ng-template>
+
+			<ng-template #h3>
+				<h3 class="accordion-header {{ state.itemHeaderClass }}">
+					<ng-template [ngTemplateOutlet]="button"></ng-template>
+				</h3>
+			</ng-template>
+
+			<ng-template #h4>
+				<h4 class="accordion-header {{ state.itemHeaderClass }}">
+					<ng-template [ngTemplateOutlet]="button"></ng-template>
+				</h4>
+			</ng-template>
+
+			<ng-template #h5>
+				<h5 class="accordion-header {{ state.itemHeaderClass }}">
+					<ng-template [ngTemplateOutlet]="button"></ng-template>
+				</h5>
+			</ng-template>
+			<ng-template #h6>
+				<h6 class="accordion-header {{ state.itemHeaderClass }}">
+					<ng-template [ngTemplateOutlet]="button"></ng-template>
+				</h6>
+			</ng-template>
+
+			<ng-template #button>
 				<button
 					type="button"
 					id="{{ state.itemId }}-toggle"
@@ -77,7 +132,7 @@ export class AccordionItemStructureDirective {
 				>
 					<ng-template [auSlotProps]="{state, widget}" [auSlot]="state.slotItemHeader"></ng-template>
 				</button>
-			</h2>
+			</ng-template>
 			<div
 				*ngIf="state.shouldBeInDOM"
 				[auUse]="widget.directives.collapseDirective"
@@ -170,6 +225,10 @@ export class AccordionItemComponent implements OnChanges, AfterContentChecked, A
 	 * Classes to add on the accordion-item body DOM element.
 	 */
 	@Input('auItemBodyClass') itemBodyClass: string | undefined;
+	/**
+	 * The html tag to use for the accordion-item-header.
+	 */
+	@Input('auItemHeadingTag') itemHeadingTag: string | undefined;
 	/**
 	 * An event fired when an item is shown.
 	 */
@@ -322,6 +381,12 @@ export class AccordionDirective implements OnChanges {
 	 * It is a prop of the accordion-item.
 	 */
 	@Input('auItemBodyClass') itemBodyClass: string | undefined;
+	/**
+	 * The html tag to use for the accordion-item-header.
+	 *
+	 * It is a prop of the accordion-item.
+	 */
+	@Input('auItemHeadingTag') itemHeadingTag: string | undefined;
 
 	//should not be documented
 	/**
diff --git a/core/lib/accordion.ts b/core/lib/accordion.ts
index 5a5fe8de7b..c8938243eb 100644
--- a/core/lib/accordion.ts
+++ b/core/lib/accordion.ts
@@ -175,6 +175,12 @@ export interface AccordionProps extends WidgetsCommonPropsAndState {
 	 * It is a prop of the accordion-item.
 	 */
 	itemBodyClass: string;
+	/**
+	 * The html tag to use for the accordion-item-header.
+	 *
+	 * It is a prop of the accordion-item.
+	 */
+	itemHeadingTag: string;
 }
 
 export interface AccordionState extends WidgetsCommonPropsAndState {
@@ -322,6 +328,10 @@ export interface AccordionItemCommonPropsAndState {
 	 * Classes to add on the accordion-item body DOM element.
 	 */
 	itemBodyClass: string;
+	/**
+	 * The html tag to use for the accordion-item-header.
+	 */
+	itemHeadingTag: string;
 }
 
 export interface AccordionItemProps extends AccordionItemCommonPropsAndState {
@@ -374,6 +384,7 @@ const defaultAccordionConfig: AccordionProps = {
 	itemVisible: false,
 	itemAnimation: true,
 	itemTransition: collapseVerticalTransition,
+	itemHeadingTag: '',
 	onItemShown: noop,
 	onItemHidden: noop,
 	onItemVisibleChange: noop,
@@ -405,6 +416,7 @@ const defaultItemConfig: AccordionItemProps = {
 	itemButtonClass: defaultAccordionConfig.itemButtonClass,
 	itemCollapseClass: defaultAccordionConfig.itemCollapseClass,
 	itemBodyClass: defaultAccordionConfig.itemBodyClass,
+	itemHeadingTag: defaultAccordionConfig.itemHeadingTag,
 };
 const accordionItemProps = Object.keys(defaultItemConfig) as (keyof AccordionItemProps)[];
 
@@ -434,6 +446,7 @@ const configAccordionValidator: ConfigValidator<AccordionProps> = {
 	itemButtonClass: typeString,
 	itemCollapseClass: typeString,
 	itemBodyClass: typeString,
+	itemHeadingTag: typeString,
 };
 
 const configItemValidator: ConfigValidator<AccordionItemProps> = {
@@ -451,6 +464,7 @@ const configItemValidator: ConfigValidator<AccordionItemProps> = {
 	itemButtonClass: typeString,
 	itemCollapseClass: typeString,
 	itemBodyClass: typeString,
+	itemHeadingTag: typeString,
 };
 
 function createAccordionItem(
@@ -553,6 +567,7 @@ export function createAccordion(config?: PropsConfig<AccordionProps>): Accordion
 			itemButtonClass$,
 			itemCollapseClass$,
 			itemHeaderClass$,
+			itemHeadingTag$,
 			onItemVisibleChange$,
 			onItemHidden$,
 			onItemShown$,
@@ -575,6 +590,7 @@ export function createAccordion(config?: PropsConfig<AccordionProps>): Accordion
 		itemButtonClass: itemButtonClass$,
 		itemCollapseClass: itemCollapseClass$,
 		itemHeaderClass: itemHeaderClass$,
+		itemHeadingTag: itemHeadingTag$,
 		onItemVisibleChange: onItemVisibleChange$,
 		onItemHidden: onItemHidden$,
 		onItemShown: onItemShown$,
diff --git a/react/lib/Accordion.tsx b/react/lib/Accordion.tsx
index 9932d3202e..d70561b594 100644
--- a/react/lib/Accordion.tsx
+++ b/react/lib/Accordion.tsx
@@ -13,9 +13,13 @@ import {createContext, forwardRef, useContext, useEffect, useImperativeHandle} f
 const AccordionDIContext: React.Context<Partial<AccordionApi>> = createContext({});
 const DefaultSlotStructure = (slotContext: AccordionItemContext) => {
 	const collapseSetRef = useDirective(slotContext.widget.directives.collapseDirective);
+	const re = new RegExp('^h[1-6]$');
+	const Heading: keyof JSX.IntrinsicElements = re.test(slotContext.state.itemHeadingTag)
+		? (slotContext.state.itemHeadingTag as keyof JSX.IntrinsicElements)
+		: 'h2';
 	return (
 		<>
-			<h2 className={`accordion-header ${slotContext.state.itemHeaderClass}`}>
+			<Heading className={`accordion-header ${slotContext.state.itemHeaderClass}`}>
 				<button
 					type="button"
 					id={`${slotContext.state.itemId}-toggle`}
@@ -28,7 +32,7 @@ const DefaultSlotStructure = (slotContext: AccordionItemContext) => {
 				>
 					<Slot slotContent={slotContext.state.slotItemHeader} props={slotContext}></Slot>
 				</button>
-			</h2>
+			</Heading>
 			{slotContext.state.shouldBeInDOM ? (
 				<div
 					className={`accordion-collapse ${slotContext.state.itemCollapseClass}`}
diff --git a/svelte/lib/accordion/ItemDefaultStructure.svelte b/svelte/lib/accordion/ItemDefaultStructure.svelte
index 79e66fa47c..49228d502b 100644
--- a/svelte/lib/accordion/ItemDefaultStructure.svelte
+++ b/svelte/lib/accordion/ItemDefaultStructure.svelte
@@ -8,12 +8,15 @@
 
 	export let state: $$Props['state'];
 	export let widget: $$Props['widget'];
+	const re = new RegExp('^h[1-6]$');
+
 	$: slotContext = {widget, state};
 	$: collapseId = state.itemId + '-collapse';
 	$: toggleId = state.itemId + '-toggle';
+	$: headingTag = re.test(state.itemHeadingTag) ? state.itemHeadingTag : 'h2';
 </script>
 
-<h2 class="accordion-header {state.itemHeaderClass}">
+<svelte:element this={headingTag} class="accordion-header {state.itemHeaderClass}">
 	<button
 		type="button"
 		id={toggleId}
@@ -34,7 +37,7 @@
 			</svelte:component>
 		</Slot>
 	</button>
-</h2>
+</svelte:element>
 {#if state.shouldBeInDOM}
 	<div class="accordion-collapse {state.itemCollapseClass}" use:widget.directives.collapseDirective id={collapseId} aria-labelledby={toggleId}>
 		<div class="accordion-body {state.itemBodyClass}">