Order is apparently wrong making the test fail.

Based on my understanding of the tabindex behavior as explained in the
html5 living standard: pre-order, depth first tree order ("before any
element whose tabindex attribute has a value equal to the value of the
tabindex attribute on the element but that is later in the document in
tree order than the element").
Merge pull request #590 from KenjiBaheux/focus-navigation-fix

Order is apparently wrong making the test fail.