blog/webapp/templates/blog_post/_update.html

<form action="{{ url_for('update_blog_post', uuid=instance.id) }}" method="post">
    <input type="hidden" name="_next" value="{{ _next or request.args.get('_next') or url_for('get_blog_post', uuid=instance.id) }}"/>
    <table>
    <tr><td>
    <label for="input-blog_post-filename">{{ _("filename") }}</label>:
    </td><td>
    <input id="input-blog_post-filename"
           value="{{ instance.filename }}"
           type="text" name="filename" autocomplete="off"
    />
    </td></tr>
    <tr><td>
    <label for="input-blog_post-title">{{ _("title") }}</label>:
    </td><td>
    <input id="input-blog_post-title"
           value="{{ instance.title }}"
           type="text" name="title" autocomplete="off"
    />
    </td></tr>
    <tr><td>
    <label for="input-blog_post-body">{{ _("body") }}</label>:
    </td><td>
        <textarea id="input-blog_post-body"
                  name="body">{{ instance.body }}</textarea>
    </td></tr>
    </table>
    <input type="submit">
</form>