With this patch, we now have an automated test to verify if a transition
is run properly on a visited link. Note that the test aims to verify
the behavior in Stylo should match that in Gecko. Due to Bug 868975, we
haven't supported transitioning on visited styles yet, so the test should
be put in our own repo for now. This test can be tweaked and put into
web-platform repo once we resolve Bug 868975.
MozReview-Commit-ID: Ci1cERXkIUK
--HG--
extra : rebase_source : 7feb1229bc2dc430bc2a1e40be40047049469fbd