kanboard_ynh/sources/app/Templates/task_edit_description.php

<div class="page-header">
    <h2><?= t('Edit the description') ?></h2>
</div>

<form method="post" action="?controller=task&amp;action=saveDescription&amp;task_id=<?= $task['id'] ?>&amp;ajax=<?= $ajax ?>" autocomplete="off">

    <?= Helper\form_csrf() ?>

    <?= Helper\form_hidden('id', $values) ?>
    <?= Helper\form_textarea('description', $values, $errors, array('autofocus', 'required', 'placeholder="'.t('Leave a description').'"'), 'description-textarea') ?><br/>
    <div class="form-help"><a href="http://kanboard.net/documentation/syntax-guide" target="_blank" rel="noreferrer"><?= t('Write your text in Markdown') ?></a></div>

    <div class="form-actions">
        <input type="submit" value="<?= t('Save') ?>" class="btn btn-blue"/>
        <?= t('or') ?>
<?php if ($ajax): ?>
        <a href="?controller=board&amp;action=show&amp;project_id=<?= $task['project_id'] ?>"><?= t('cancel') ?></a>
<?php else: ?>
        <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>"><?= t('cancel') ?></a>
<?php endif ?>
    </div>
</form>