Add mute to try to get youtube video to play

Author: sanason

test_site/youtube.html

@@ -15,7 +15,7 @@
                                                src="https://www.youtube-nocookie.com/embed/7b-fcRQ2Q7k" frameborder="0" width="500"
                                                allowfullscreen="" alt="MedWatch Tips &amp; Tools (January 2016)"></iframe></div>
     <p><iframe title="Time-lapse of X-59 aircraft (May 2019 - June 2021)" width="500" height="250"
-               src="https://www.youtube.com/embed/LcvYjkCBY28?feature=oembed" frameborder="0"
+               src="https://www.youtube.com/embed/LcvYjkCBY28?feature=oembed&mute=1" frameborder="0"
                allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture;"
                allowfullscreen=""></iframe></p>
     <iframe width="500" height="250" src="https://www.youtube-nocookie.com/embed/BkvRu5-Cuz4"