Update srcset parsing tests to current spec and add some new ones
Missing newline
Anchor, Area & Link elements no longer matches :enabled

HTML spec has been modified [1] to disable support for :enabled CSS
selector on Anchor, Area & Link elements, after discussion on W3C
Bugzilla [2].

[1] https://html5.org/r/8818
[2] https://www.w3.org/Bugs/Public/show_bug.cgi?id=26622
Merge pull request #1263 from brunoabinader/css-selector-pseudo-class-enabled

Anchor, Area & Link elements no longer matches :enabled; r=Ms2ger
picture: Flip pass condition on the media="," test and add a another test
Merge pull request #1262 from zcorpan/img-srcset-drop-unknown

Update srcset parsing tests to current spec and add some new ones
Merge pull request #1265 from zcorpan/picture-media-comma

picture: Flip pass condition on the media="," test and add a another test