when youtube is played on portrait , fullscreen user press back button , then app is killed.
it’s totally weird because app is not killed when horizontal fullscreen mode, but terminated on portrait full screen mode…
<iframe frameborder="0"
webkitallowfullscreen mozallowfullscreen
allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen
width="90%" height="280"
[src]="a.url">
</iframe>