Use parentElement instead of parent

[vlaellayug]

Checking the focusabeElements object it contains the following fields:

I didn't see any parent field, so used the parentElement instead.

This fixes #16256

[github-actions]

Hi there @vlaellayug, thank you for this contribution! 👍

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[mikecp]

Hi @vlaellayug ,

Thanks a lot for spotting this issue and providing the fix 👍
Since this is a fix for V13, it will come in the next V13 patch release, which I don't think we have a specific date for 😅
But a member of the core collaborators team will have a look at it soon in order to get it in "asap".

Cheers!