<fieldset id="tableFilter">
    <legend><?= __('Filters'); ?></legend>
    <div class="formelement">
        <label for="filterText"><?= __('Containing the word:'); ?></label>
        <input name="filterText" type="text" id="filterText"
               style="vertical-align: baseline;"
               value="<?= htmlspecialchars($filterValue); ?>" />
    </div>
</fieldset>