App sometimes cannot resume on Wasm on mobile Chrome

[hajimehoshi]

wasm_exec.js:327 [Intervention] Ignored attempt to cancel a touchstart event with cancelable=false, for example because scrolling is in progress and cannot be interrupted.

EDIT: The above warning is shown when the scrolling starts outside of the iframe and ends inside of the iframe, and vice versa.

[hajimehoshi]

ebiten.org/examples/animation.html

1. Open the above page on a mobile browser (e.g., Android Chrome)
2. Show the side menu
3. Close the side menu
4. The game stops

[hajimehoshi]

I could reproduce this when emulating mobile browsers in a desktop Chrome.

[hajimehoshi]

The cause is that focus event might not be called after blur.

[hajimehoshi]

I found this issue again 🤔

[hajimehoshi]

My observation is that focus/blur and visibilitychange events might not be fired when the mobile device comes back from power off. After switching browser tabs, the app starts again.