<script>
function showDescription(id) {
$(".description").each(function () {
$(this).hide();
});
$("#" + id).show();
}
</script>
<ul>
<li>
1. <a href="#1" onclick="showDescription('one'); return false;">Один <span>раз</span></a>
</li>
<li>
2. <a href="#1" onclick="showDescription('two'); return false;">Два <span>два</span></a>
</li>
<li>
3. <a href="#1" onclick="showDescription('three'); return false;">Три <span>три</span></a>
</li>
</ul>
<div class="descriptionContainer">
<div id="one" class="description">
<h1>Заголовок 1</h1>
Lorem Ipsum is simply dummy text
</div>
<div id="two" class="description">
<h1>Заголовок 2</h1>
Lorem Ipsum is simply dummy text
</div>
<div id="three" class="description">
<h1>Заголовок 3</h1>
Lorem Ipsum is simply dummy text
</div>
</div>
<?php
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");
LocalRedirect('https://mysite.ru');
$iblock = \Bitrix\Iblock\Iblock::wakeUp(9);
$elements = $iblock->getEntityDataClass()::getList(
[
'filter' => ['ID' => 28770],
'select' => ['ID', 'C_CATALOG_LABELS']
]
)->fetch();
\Bitrix\Main\Diag\Debug::dump($elements);