Yikes! It's part of a hidden video that shouldn't play until you explicitly open it. What's your browser/OS? I tested on Chrome, Safari, and FF on mac as well as iOS.
I also just added a muted attribute to the `video` tag so it should no longer do that even if I messed up the JS for some browser somewhere. I encourage you to try it once again to confirm.
I also just added a muted attribute to the `video` tag so it should no longer do that even if I messed up the JS for some browser somewhere. I encourage you to try it once again to confirm.