Does not recognize text in shadow DOM

[nolanlawson]

Thank you for writing this library! I may have found an issue, though, with shadow DOM support.

For an element containing a shadow root, e.g.:

<button>
  <x-component>
    #shadow-root
      hello world
  </x-component>
</button>

In this example, the accessible name contains "hello world". But accname does not recognize this text, instead returning an empty string. Here is a minimal repro.

[nolanlawson]

BTW there is more discussion about how the accessible name spec interacts with shadow DOM in eps1lon/dom-accessibility-api#768 and w3c/accname#51 .