fix: bring back rendering of Events and Namespaces
fix: bring back rendering of Events and Namespaces

The `html` function didn't properly handle the following usecase:

```js
html`${html`<b>1</b><b>2</b>`}${html`<b>3</b><b>4</b>`}`
```

This patch fixes arrays of DocumentFragments.

puppeteer/pptr.dev,puppeteer/pptr.dev