zulip/static/templates/settings/settings_checkbox.handlebars

<div class="input-group {{#if is_nested}}disableable{{/if}} {{#if_not_a_or_b_and_not_c is_parent_setting_enabled push_notifications_tooltip page_params.realm_push_notifications_enabled}}control-label-disabled{{/if_not_a_or_b_and_not_c}}">
    <label class="checkbox">
        <input type="checkbox" class="inline-block setting-widget" name="{{setting_name}}" data-setting-widget-type="bool"
          id="{{prefix}}{{setting_name}}"
          {{#if_not_a_or_b_and_not_c is_parent_setting_enabled push_notifications_tooltip page_params.realm_push_notifications_enabled}}disabled="disabled"{{/if_not_a_or_b_and_not_c}}
          {{#if is_checked}}
          {{#unless_a_not_b push_notifications_tooltip page_params.realm_push_notifications_enabled}}
          checked="checked"
          {{/unless_a_not_b}}
          {{/if}} />
        <span></span>
    </label>
    <label for="{{prefix}}{{setting_name}}" class="inline-block" id="{{prefix}}{{setting_name}}_label">
        {{{label}}}
    </label>
    {{#if push_notifications_tooltip}}
    <i class="fa fa-question-circle settings-info-icon" {{#if page_params.realm_push_notifications_enabled}}style="display:none"{{/if}}  data-toggle="tooltip"
      title="{{t 'Mobile push notifications are not configured on this server.' }}"></i>
    {{/if}}
    {{{end_content}}}
</div>