una/template/form_field_custom_suggestions.html

<div id="__id__" class="bx-form-input-autotoken bx-def-font-inputs bx-form-input-text">
    __vals__
    <input type="text" value="" class="bx-def-font-inputs bx-form-input-text" autocomplete="off" autocapitalize="off" autocorrect="off" />
</div>
<script>
	$(function(){
        $('#__id__ input').on('focus', function () {
            $(this).attr("placeholder", "__placeholder__");
        });
		bx_autocomplete_fields('__id__','__url_get_recipients__','__name__',__b_img__,__only_once__,__on_select__);
	});
</script>