szurubooru/client/html/users_header.tpl

<div class='user-list-header'>
    <form class='horizontal'>
        <div class='input'>
            <ul>
                <li>
                    <%= ctx.makeTextInput({text: 'Search query', id: 'search-text', name: 'search-text', value: ctx.parameters.query}) %>
                </li>
            </ul>
        </div>
        <div class='buttons'>
            <input type='submit' value='Search'/>
            <a class='append' href='/help/search/users'>Syntax help</a>
        </div>
    </form>
</div>