Magento

To use the mmenu.js plugin in a Magento project, add "magento" to the wrappers option.

<script>
    document.addEventListener(
        "DOMContentLoaded", () => {
            new Mmenu( "#my-menu", {
                wrappers: ["magento"]
            });
        }
    );
</script>

What it does

Using the "magento" wrapper will set the classNames.selected configuration option to the default classname used by Magento.

Next wrapper:
Olark