A simple hack to support tabbed navigation both on Concrete CMS v8.X & v9.X

CrossCompatibleTabbedNavHack.php

<?php
// v8 compatibility
if (Config::get('concrete.version_installed') < 9) {
    ?>
    <script>
        $('.tab-pane').each(function () {
            $(this).removeClass('active').attr('id', 'ccm-tab-content-' + $(this).attr('id'));
            if ($(this).hasClass('show')) {
                $(this).removeClass('show').show();
            }
        });
    </script>
<?php
}

full-example.php

<?php defined('C5_EXECUTE') or die('Access Denied.');
// @see https://documentation.concretecms.org/tutorials/using-tabbed-panels-in-concrete5-5-7

echo Core::make('helper/concrete/ui')->tabs([
    ['feed-details', t('Feed Details'), true],
    ['feed-settings', t('Feed Settings')],
    ['text-colors', t('Text and Colors')],
]);
?>

<div class="tab-content">
    <div id="feed-details" class="tab-pane show active" role="tabpanel">
        <div class="form-group">
            <?php echo $form->label('text1', t('Text 1')); ?>
            <?php echo $form->text('text1', $text1)?>
        </div>
    </div>

    <div id="feed-settings" class="tab-pane" role="tabpanel">
        <div class="form-group">
            <?php echo $form->label('text2', t('Text 2')); ?>
            <?php echo $form->text('text2', $text2)?>
        </div>
    </div>

    <div id="text-colors" class="tab-pane" role="tabpanel">
        <div class="form-group">
            <?php echo $form->label('text3', t('Text 3')); ?>
            <?php echo $form->text('text3', $text3)?>
        </div>
    </div>
</div>

<?php
// v8 compatibility
if (Config::get('concrete.version_installed') < 9) {
    ?>
    <script>
        $('.tab-pane').each(function () {
            $(this).removeClass('active').attr('id', 'ccm-tab-content-' + $(this).attr('id'));
            if ($(this).hasClass('show')) {
                $(this).removeClass('show').show();
            }
        });
    </script>
    <?php
}

https://documentation.concretecms.org/tutorials/using-tabbed-panels-in-concrete5-5-7