No Temasys alert on mobile Web

react/features/unsupported-browser/components/UnsupportedMobileBrowser.js

                         </button>
                     </a>
                 </div>
+
+                {
+                    this._renderStyle()
+                }
             </div>
         );
     }
+
+    /**
+     * Renders an HTML style element with CSS specific to
+     * this UnsupportedMobileBrowser.
+     *
+     * @private
+     * @returns {ReactElement}
+     */
+    _renderStyle() {
+        // Temasys provide lib-jitsi-meet/modules/RTC/adapter.screenshare.js
+        // which detects whether the browser supports WebRTC. If the browser
+        // does not support WebRTC, it displays an alert in the form of a yellow
+        // bar at the top of the page. The alert notifies the user that the
+        // browser does not support WebRTC and, if Temasys provide a plugin for
+        // the browser, the alert contains a button to initiate installing the
+        // browser. When Temasys do not provide a plugin for the browser, we do
+        // not want the alert on the unsupported-browser page because the
+        // notification about the lack of WebRTC support is the whole point of
+        // the unsupported-browser page.
+        return (
+            <style type = 'text/css'>
+                {
+                    'iframe[name="adapterjs-alert"] { display: none; }'
+                }
+            </style>
+        );
+    }
 }
 
 /**