This test checks to see what happens when the same accesskey is set on multiple elements including cases where the elements are in the a shadow tree.

1c 1w   3c   4w  5w  6c
1: correct button focused, earlier in document
1: correct button clicked, earlier in document
2: correct button focused, in shadow
2: correct button clicked, in shadow
3: correct button focused, earlier in document
3: correct button clicked, earlier in document
4: correct button focused, earlier in document and in shadow
4: correct button clicked, earlier in document and in shadow
5: correct button focused, earlier in document and in shadow
5: correct button clicked, earlier in document and in shadow
6: correct button focused, earlier in document in slot
6: correct button clicked, earlier in document in slot