<p><b>@mmd-osm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1990#discussion_r216451458">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>Sure. This may really be kind of an overkill, and it's only useful for mobile devices anyway. I'm perfectly fine to remove those two lines 191+192 again. Their only purpose is to skip <code>$('.welcome').show()</code>, if the screen is too small.</p>
<p>Reason being that small.scss defines the following <code>display:none</code> with <code>!important</code>. So whatever we try to do in terms of show(), it gets overruled immediately (with some flickering on the mobile screen again).</p>
<pre><code>  #sidebar .welcome,
  #sidebar #banner {
    display: none !important;
  }
</code></pre>
<p>According to <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/matchMedia#Browser_compatibility" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/API/Window/matchMedia#Browser_compatibility</a>, window.matchMedia support is quite good. Line 191 should cover those browsers, where it's not yet supported.</p>

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