Activate the "Open test page" button, which opens the example to test in a new window and runs a script that set focus on a link after the checkbox
With the reading cursor on the 'Navigate backwards from here' link, navigate to the 'All condiments' checkbox. Do this with each of the following commands or command sequences.
Shift+X
Shift+F
Shift+Tab
Up Arrow, then Up Arrow
Record Results
Navigate backwards to a mixed checkbox in reading mode