Materialize/doc/user/layouts/shortcodes/public-preview.html

<div class="public-preview">
    <strong class="gutter">PREVIEW</strong>
    {{ with .Inner}}{{.|$.Page.RenderString}}{{else}}This feature{{ end }} is in
    <strong><a href="https://materialize.com/preview-terms/">public preview</a></strong>.
    It is under active development and may have stability or performance issues.
    It isn't subject to our backwards compatibility guarantees.
</div>