searxng/searx/templates/oscar/categories.html

<!-- used if scripts are disabled -->
<noscript>
<div id="categories" class="btn-group btn-toggle">
{% for category in categories %}
    <!--<div class="checkbox">-->
        <input class="hidden" type="checkbox" id="checkbox_{{ category|replace(' ', '_') }}_nojs" name="category_{{ category }}" {% if category in selected_categories %}checked="checked"{% endif %} />
        <label class="btn btn-sm btn-primary active label_hide_if_not_checked" for="checkbox_{{ category|replace(' ', '_') }}_nojs">{{ _(category) }}</label>
        <label class="btn btn-sm btn-default label_hide_if_checked" for="checkbox_{{ category|replace(' ', '_') }}_nojs">{{ _(category) }}</label>
    <!--</div>-->
    {% if category in selected_categories %}<input class="hidden" type="checkbox" id="checkbox_{{ category|replace(' ', '_') }}_dis_activation" name="category_{{ category }}" value="off" checked="checked"/>{% endif %}
{% endfor %}
</div>
</noscript>

<div id="categories" class="btn-group btn-toggle hide_if_nojs" data-toggle="buttons">
{% for category in categories %}
    <label class="btn btn-sm {% if category in selected_categories %}btn-primary active{% else %}btn-default{% endif %}" data-btn-class="primary">
        <input class="hidden" type="checkbox" id="checkbox_{{ category|replace(' ', '_') }}" name="category_{{ category }}" {% if category in selected_categories %}checked="checked"{% endif %} />{{ _(category) }}</label>
{% endfor %}
</div>