<p><b>@tomhughes</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1990#discussion_r216448304">app/assets/javascripts/index.js</a>:</p>
<pre style='color:#555'>> @@ -187,8 +187,10 @@ $(document).ready(function () {
     $.cookie('_osm_location', OSM.locationCookie(map), { expires: expiry, path: '/' });
   });
 
-  if ($.cookie('_osm_welcome') === 'hide') {
-    $('.welcome').hide();
+  if ($.cookie('_osm_welcome') !== 'hide' &&
+     (typeof window.matchMedia !== "function" ||
+     !window.matchMedia("only screen and (max-width:768px)").matches)) {
</pre>
<p>This doesn't appear to have anything to do with resolving <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="351884415" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/1951" href="https://github.com/openstreetmap/openstreetmap-website/issues/1951">#1951</a> so perhaps you could explain what it's about?</p>
<p>How widely supported is that function? I mean I can see you're concerned it might not exist so it's obviously not universal - checking it's type is probably overkill in any case unless we're expecting somebody to create <code>window.matchmedia</code> with some other type to annoy us!</p>

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