[whatwg/dom] Support `getElementsByTagName(tag)` for DocumentFragment (Issue #1382)

yezhizhen created an issue (whatwg/dom#1382)

### What problem are you trying to solve?

https://github.com/w3c/webdriver/issues/1903
There is no reason we don't support `getElementsByTagName(tag)` for `DocumentFragment`, as it already supports `querySelector`, `getElementById` etc. Right now this causes trouble for WebDriver standard.

### What solutions exist today?

Use `querySelectorAll` to mimic the behaviour.

### How would you solve it?

_No response_

### Anything else?

_No response_

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