wallabag/src/Wallabag/CoreBundle/Resources/views/themes/material/Entry/new_form.html.twig

<form name="entry" method="post" action="{{ path('new_entry')}}">
    {% if form_errors(form) %}
        <span class="black-text">{{ form_errors(form) }}</span>
    {% endif %}

    {% if form_errors(form.url) %}
        <span class="black-text">{{ form_errors(form.url) }}</span>
    {% endif %}

    {{ form_widget(form.url, { 'attr': {'autocomplete': 'off', 'placeholder': 'http://website'} }) }}

    <div class="hidden">{{ form_rest(form) }}</div>
</form>