option/optgroup in menulist are never focusable even with a tabindex
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS isFocusable("optionA") is false
PASS isFocusable("optgroupB") is false
PASS isFocusable("optionC") is false
PASS isFocusable("optionD") is true
PASS successfullyParsed is true
TEST COMPLETE
A
C
D