made mastodon share-button portable and only visible for javascript browsers

src/css/xrforge.css

@@ -18,6 +18,9 @@
 
 .page{ width:640px; }
 
+body .script{ visibility: hidden; }
+body.script .script{ visibility: visible !important; }
+
 /* spacers */
 .margin1L{ margin: 0px 20px 10px 0px;}
 .margin1{ margin: 10px 20px; }

src/page/footer.html

@@ -46,6 +46,9 @@
     <!-- JanusXR portalroom, see https://janusxr.org for markup -->
     ${janusxr}
 
+    <script>
+      document.body.classList.add('script') // show javascript buttons for modern browsers 
+    </script>
   </body>
 </html>