una/template/block_async_text_units_list.html

<template class="bx-cont-ph-text-unit">
    <div class="bx-base-text-unit bx-base-text-unit-ext bx-def-box bx-def-round-corners bx-def-color-bg-box bx-def-margin-bottom">
        <div class="bx-base-text-unit-cover bx-base-text-unit-cover bx-def-round-corners bx-cont-ph" style="height:18.75rem;"></div>
        <div class="bx-base-text-unit-text bx-def-padding bx-def-box-sizing">
            <div class="bx-base-text-unit-title">
                <h2 class="bx-def-font-h2 bx-cont-ph-inline" style="width:20rem; margin:0;">&nbsp;</h2>
            </div>           
            <div class="bx-base-text-unit-info bx-def-margin-sec-top bx-def-font-small">
                <div class="bx-base-general-unit-meta">
                    <ul id="bx-posts-snippet-meta" class="bx-menu-custom bx-menu-custom-hor bx-menu-hor-inline bx-menu-object-bx_posts_snippet_meta bx-clearfix">
                        <li class="bx-menu-item bx-menu-item-date"><span class="bx-base-general-unit-meta-item bx-cont-ph" style="width:10rem;">&nbsp;</span></li>
                    </ul>
                </div>
            </div>
            <div class="bx-base-text-unit-summary bx-def-margin-sec-top bx-clearfix">
                <div class="bx-cont-ph bx-def-margin-thd-bottom">&nbsp;</div>
                <div class="bx-cont-ph bx-def-margin-thd-bottom">&nbsp;</div>
                <div class="bx-cont-ph bx-def-margin-thd-bottom">&nbsp;</div>
                <div class="bx-cont-ph bx-def-margin-thd-bottom">&nbsp;</div>
            </div> 
        </div>
    </div>
</template>

<script>
    var iBlockID = '__id__';
    var sTmpl = $('#bx-page-block-' + iBlockID + ' .bx-cont-ph-text-unit').html();
    $('#bx-page-block-' + iBlockID + ' .bx-db-content').append(sTmpl + sTmpl + sTmpl);
    $(document).ready(function () {
        getHtmlData($('#bx-page-block-' + iBlockID), bx_append_url_params(document.location.href, 'dynamic=tab&pageBlock=' + iBlockID), undefined, 'post', false, {includedCss: JSON.stringify(aIncludedCss), includedJs: JSON.stringify(aIncludedJs)}, false);
    });
</script>