Snav Tiny Table Traversal

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| a | a | a | | a | a | a | | a | a | a |

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This test ensures the basic table traversal correctness of Spatial Navigation (SNav) algorithm:
focusable elements in a table element should be accessible.
* Navigation steps:

1. Loads this page, focus goes to "start" automatically.
2. Focus moves along the elements in the table, eventually going to outer southward and eastward links,
   but going back inside the table later on.