[w3c/uievents] [Question] select change + mousedown behavior (#201)

Hi,

After reading [this issue](https://github.com/facebook/react/issues/12584) and realizing that Chrome and Firefox handle the change event in different ways, I cannot find an answer to this one... I made a simple pen to illustrate the example (no React, just plain HTML): https://codepen.io/nuragic/pen/xWMaGN?editors=1011

### Steps to reproduce

Just click on the `select` and pick any value.

### Results


Chrome:
```
"onmousedown"
"onchange"
```

Firefox:
```
"onmousedown"
"onmousedown"
"onchange"
```

😕 

The spec https://w3c.github.io/uievents/#event-type-mousedown says:

> A user agent MUST dispatch this event when a pointing device button is pressed over an element.

Could anyone clarify which one is correct (or if both are ok)?

Thanks! 

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