Bug 1459231 Comment 3 Edit History

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~~I just noticed that dispatching `DOMActivate` for button and input ([code](https://searchfox.org/mozilla-central/rev/4c065f1df299065c305fb48b36cdae571a43d97c/dom/html/HTMLButtonElement.cpp#196-218)) should probably be part of activation behavior. Though we should look at when other browsers dispatch it.~~

Edit: here is a test, this works as expected
```
data:text/html,<button id=btn>test</button><script>btn.addEventListener("DOMActivate", e=> console.log(e.eventPhase))</script>
```

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