Re: [whatwg/fullscreen] Impossible to customize the style of a dialog's ::backdrop residing inside a Shadow DOM. (#124)

You can include `<style>` element within Shadow DOM to achieve the same result 

```
let d = document.querySelector('#parent');
let shadowRoot = d.attachShadow({ mode: 'open' });
let style = document.createElement("style");
style.textContent = `::backdrop {
  --bg-color: blue;
}

dialog::backdrop {
  background-color: var(--bg-color);
}`;
let child = document.createElement('dialog');
child.textContent = 'foo';

shadowRoot.appendChild(style);
shadowRoot.appendChild(child);

let b = document.querySelector('button');
b.addEventListener('click', () => {
  child.showModal();
});
```

https://jsfiddle.net/062m2fhv/5/

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