Bug 1529953 Comment 1 Edit History

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Original comment by
on 
See [wheelDelta value of Chrome](https://developer.mozilla.org/en-US/docs/Web/Events/mousewheel#Chrome). Even if we follow Chrome's spec, the behavior does not make sense (although I don't check the latest behavior of Chrome).

Currently, I'm investigating what we can do for bug 1406243. One possible idea is, start to dispatch `DOMMouseScroll` with `0` for `detail` even in the cases we dispatch only `MozMousePixelScroll`.
Revision 1 by
on 
See [wheelDelta value of Chrome](https://developer.mozilla.org/en-US/docs/Web/Events/mousewheel#Chrome). Even if we follow Chrome's spec, the behavior does not make sense (although I don't check the latest behavior of Chrome).

Currently, I'm investigating what we can do for bug 1406243. One possible idea is, start to dispatch `DOMMouseScroll` with `0` for `detail` even in the cases we dispatch only `MozMousePixelScroll`. But if there are web apps which do like the following, it breaks the web apps anyway:

```
foo.addEventListener("DOMMouseScroll", (event) => {
  if (event.detail > 0) {
    // Do something for scroll to bottom event.
    return;
  }
  // Do something for scroll to up event.
});
```

So, `0` may be handled as scroll down or up.

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