Show / hide element depending on the presence of another element The element must me hidden by default in css
document.addEventListener("DOMContentLoaded", function(event) {
if (document.querySelector(".article-marker-tag")) {
var msg = document.getElementById('section-social-links');
msg.style.display = "block";
}
});
<div id="section-social-links">
<div class="article-marker-tag">Article content</div>
</div>
#section-social-links {
display: none;
}