search_input.txp

<div class="search" aria-label="<txp:text item="search" />" itemscope itemtype="https://schema.org/WebSite">
    <meta itemprop="url" content="<txp:site_url />">
    <form role="search" method="get" action="<txp:site_url />" itemprop="potentialAction" itemscope itemtype="https://schema.org/SearchAction">
        <meta itemprop="target" content="<txp:site_url />?q={q}">
        <input name="q" type="search" itemprop="query-input" placeholder="<txp:text item="search" />"<txp:if_search> value="<txp:search_term />"</txp:if_search>>
    </form>
</div>