ajout des attributs "data-bs-collapse" et "data-bs-target".

    <xsl:template match="/">

        <xsl:variable name="topEntry"

                      select="/menu//entry[target/text()=$selectedTarget]/ancestor-or-self::entry[@type='main']"/>

        <nav class="navbar navbar-expand-lg navbar-light bg-light">

            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown"

                    aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">

        <nav class="navbar navbar-expand-lg navbar-light">

            <a class="navbar-brand" href="#">Menu</a>

            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">

                <span class="navbar-toggler-icon"></span>

            </button>

            <div class="collapse navbar-collapse" id="navbarNavDropdown">

            <div class="collapse navbar-collapse" id="navbarSupportedContent">

                <ul class="navbar-nav">

                    <xsl:for-each select="/menu/entry[@type='main']">

                        <xsl:choose>