This also applies to float-should-dirty-line-when-adjacent-to-line-breaks-2.html
If you open the test locally in content_shell, or even Chrome, and then reload a few times, you'll see that the test fails quite often (i.e. all the words end up on the same line), but far from always.
Or just run-webkit-tests.
Comment 1 by msten...@opera.com
, Feb 23 2017