Replace "style=display:none" with HTML data tags:

When storing metadata in an HTML node, you can use data attributes, which is
more declarative, and doesn't require rendering an invisible node.

See: https://developer.mozilla.org/en-US/docs/Learn/HTML/Howto/Use_data_attributes

layouts/shortcodes/artlist.html

@@ -1,5 +1,5 @@
 <ul id=artlist>
 {{range.Site.RegularPages}}
-<li><a href="{{.Permalink}}">{{.Title}}<span style="display:none">{{.Params.Tags}}</span></a></li>
+<li data-tags="{{.Params.Tags}}"><a href="{{.Permalink}}">{{.Title}}</a></li>
 {{end}}
 </ul>