[whatwg/dom] Should `Attr.isConnected` return `false` if element is connected? (Issue #1448)

caugner created an issue (whatwg/dom#1448)

### What is the issue with the DOM Standard?

This was originally reported to BCD in https://github.com/mdn/content/issues/42933.

```js
const element = document.createElement('div');
element.setAttribute('class', 'test');
const attribute = element.getAttributeNode('class');
// Both `element.isConnected` and `attribute.isConnected` are false
document.body.append(element);
// Now `element.isConnected` is true, but `attribute.isConnected` still false in Chrome/Firefox/Safari
```

Assuming this is expected, should this behavior be mentioned in the spec?

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