lib/Formatting/BbcodeEtc/templates/spoiler.php
<?php
$counter = rand();
$filter = $this->getFilter();
$show = $filter->message('spoiler') . ' (' . $filter->message('show') . ')';
$hide = $filter->message('spoiler') . ' (' . $filter->message('hide') . ')'; ?>
<div class="decoda-spoiler">
<button class="decoda-spoiler-button" type="button" onclick="<?php echo str_replace('{id}', $counter, $spoilerToggle); ?>"><?php echo $show; ?></button>
<div class="decoda-spoiler-content" id="spoiler-content-<?php echo $counter; ?>" style="display: none">
<?php echo $content; ?>
</div>
</div>