Hi everybody,

Steps to reproduce the issue

1. Create a new menu module with a template which includes no overrides and the module position is deffined with the html5 style.
2. Put the module to a module position of the template.
3. Under Advanced take the setting "Collapsible Default Menu" for Layout and take the setting "div" for Module-Tag.

Expected result

<div class="moduletable module-menu">
			<h3 >This Site</h3>		
<div class="navbar navbar-expand-md">
	<button class="navbar-toggler navbar-toggler-right" type="button" data-bs-toggle="collapse" data-bs-target="#navbar26" aria-controls="navbar26" aria-expanded="false" aria-label="Navigation umschalten">
		<span class="icon-menu" aria-hidden="true"></span>
	</button>
	<div class="collapse navbar-collapse" id="navbar26">
		<ul class="mod-menu mod-list nav menu">
<li class="nav-item item-435 default"><a href="/index.php" >Home</a></li><li class="nav-item item-294 parent"><a href="/index.php/site-map" >Site Map</a></li><li class="nav-item item-233"><a href="/index.php/login" >Login</a></li><li class="nav-item item-238 parent"><a href="/index.php/sample-sites" >Sample Sites</a></li><li class="nav-item item-448"><a href="/administrator" target="_blank" rel="noopener noreferrer">Site Administrator</a></li><li class="nav-item item-455"><a href="/index.php/using-joomla/extensions/components" >Example Pages</a></li></ul>
	</div>
</div>
</div>

Actual result

<div class="moduletable module-menu">
			<h3 >This Site</h3>		
<nav class="navbar navbar-expand-md">
	<button class="navbar-toggler navbar-toggler-right" type="button" data-bs-toggle="collapse" data-bs-target="#navbar26" aria-controls="navbar26" aria-expanded="false" aria-label="Navigation umschalten">
		<span class="icon-menu" aria-hidden="true"></span>
	</button>
	<div class="collapse navbar-collapse" id="navbar26">
		<ul class="mod-menu mod-list nav menu">
<li class="nav-item item-435 default"><a href="/index.php" >Home</a></li><li class="nav-item item-294 parent"><a href="/index.php/site-map" >Site Map</a></li><li class="nav-item item-233"><a href="/index.php/login" >Login</a></li><li class="nav-item item-238 parent"><a href="/index.php/sample-sites" >Sample Sites</a></li><li class="nav-item item-448"><a href="/administrator" target="_blank" rel="noopener noreferrer">Site Administrator</a></li><li class="nav-item item-455"><a href="/index.php/using-joomla/extensions/components" >Example Pages</a></li></ul>
	</div>
</nav>
</div>

System information (as much as possible)

See attached file.

Additional comments

systeminfo-2022-01-25T10 42 44+01 00.txt

The <nav> tag after the <h3> tag is not accessible because the screenreader skips the heading when jumping to the navigation.
Take the setting "nav" for Module-Tag in the advanced settings, than there will be two <nav> tags:

<nav class="moduletable module-menu" aria-labelledby="mod-26">
			<h3 id="mod-26">This Site</h3>		
<nav class="navbar navbar-expand-md">
	<button class="navbar-toggler navbar-toggler-right" type="button" data-bs-toggle="collapse" data-bs-target="#navbar26" aria-controls="navbar26" aria-expanded="false" aria-label="Toggle Navigation">
		<span class="icon-menu" aria-hidden="true"></span>
	</button>
	<div class="collapse navbar-collapse" id="navbar26">
		<ul class="mod-menu mod-list nav menu">
<li class="nav-item item-435 default"><a href="/index.php" >Home</a></li><li class="nav-item item-294 parent"><a href="/index.php/site-map" >Site Map</a></li><li class="nav-item item-233"><a href="/index.php/login" >Login</a></li><li class="nav-item item-238 parent"><a href="/index.php/sample-sites" >Sample Sites</a></li><li class="nav-item item-448"><a href="/administrator" target="_blank" rel="noopener noreferrer">Site Administrator</a></li><li class="nav-item item-455"><a href="/index.php/using-joomla/extensions/components" >Example Pages</a></li></ul>
	</div>
</nav>
</nav>

Markus