w3c/web-platform-tests — pull request #590 by KenjiBaheux (2014-02-03 08:51:36+00:00)
Title: 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").