{% load wagtailadmin_tags core_tags %}

<button id="PREVIEW-BUTTON" class="button {% if icon %}icon icon-view{% endif %}">{{ label }}  (LATEST DRAFT) </button>

<script>
    document.getElementById("PREVIEW-BUTTON").addEventListener("click", function(e){
        e.preventDefault()
        let url = '{% get_client_domain %}' + '{{ page.url }}' + '?draft={% get_preview_code %}'
        window.open(url, '_blank')
    });
</script>