Re: [w3ctag/design-reviews] HTMLInputElement showPicker() (Issue #688)

Rejecting the `showPicker()` promise with `NotSupportedError ` may help with whether picker was shown or not. What do you think @domenic?

```js
if ("showPicker" in HTMLInputElement.prototype) {
  try {
    await document.querySelector("input").showPicker();
  }
  catch (error) {
    if (error == "NotSupportedError") {
      /* Show custom picker */
    }
  }
} else {
  /* Show custom picker */
}


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