[w3c/uievents] isComposing in onInput is always `true` while you turn on IME until recomposition in Chromium (Issue #394)

tats-u created an issue (w3c/uievents#394)

https://codepen.io/tats-u/pen/VYZBEWM

The following process doesn't work in Chromium. Works in Firefox as intended. Which behavior is correct?

```js
document.addEventListener("DOMContentLoaded", () => {
  textArea.addEventListener("input", (event) => {
    if (event.isComposing) { // skip while IME input because it's half-baked
    return;
  }
    // your process here
  });
});
```

Reproduction:

1. Open https://codepen.io/tats-u/pen/VYZBEWM in a Chromium-based browser
2. Turn your IME on (e.g. Google Japanese Input / Microsoft Japanese Input)
3. Input some Japanese using IME
4. Press Enter to commit

- Firefox: the rendered HTML will be changed
- Chromium: HTML preview is will not be changed

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