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The table element in the IDE has no obvious way to interact with standard Voice Over commands (VOICE OVER + SHIFT + ARROW keys and VOICE OVER + ARROW keys). Voice Over does not read the contents of the table to the user and the table itself is read as “empty table”. There could also be a problem with clicking elements which could not be tested since the navigation did not work. An example for this can be found in Preferences > Keymap in the “Actions | Shortcut | Category” table.
A JDK bug: https://bugs.openjdk.java.net/browse/JDK-7124280
And: https://bugs.openjdk.java.net/browse/JDK-7124284