Maybe a cross-browsing bug?̊̈
I’ve never seen a browser that doesn’t scroll horizontally in mobile.
In particular, I’ve used HN with iOS 12.2 Webkit and Android Google Chrome Evergreen and Chromium based browsers...
Maybe a bug in Android Firefox?̊̈ (Or the browser you’re using?̊̈)
Yeah, that's fine for your comment, but what I want to say isn't the same as what you said. I'm quoting a heading; it would be weird to break it in half, but it's too wide to display correctly even on my tablet.