Squashed 'css3/css-parsing-tests/' content from commit 101c330

git-subtree-dir: css3/css-parsing-tests
git-subtree-split: 101c330cb06b3e6de7f30509b4237421b94e3f28
Merge commit 'bb6212776c3131b81345a2d0b31c6837fc485d20' as 'css3/css-parsing-tests'
Add parser with test cases.