Actually that is what we're going to do. I'm hoping to merging in code, soon, that will change it to use pointerId === -1 and then fall back to screenX === 0.

Actually that is what we're going to do. I'm hoping to merging in code, soon, that will change it to use pointerId === -1 and then fall back to screenX === 0. At the time this code was originally written four years ago or whenever it was, not all browsers used PointerEvent for click.