test case from jacketli: mask-repeat round property
[testtwf-shenzhen]Add tests for CSS UI box-sizing: border-box|content-box|inherit
creating new ttwf_shenzhen directory
Merge pull request #328 from cabanier/master

creating new ttwf_shenzhen directory
Fixed url
Fix missing resources submodule.
Merge pull request #331 from w3c/fix-submodules

Fix missing resources submodule.
CSS Shapes Tests: Circle - invalid 1 arg
Merge pull request #332 from biqing/master

CSS Shapes Tests: Circle - invalid 1 arg
creating new ttwf_shenzhen directory
Fixed url
Fix missing resources submodule.
Test case: Blending in a group with opacity.

Address:
https://github.com/w3c/csswg-test/issues/280
Merge pull request #333 from windtale/master

Test case: Blending in a group with opacity.
CSS Shapes Tests: Circle - invalid r values
Merge pull request #335 from biqing/master

CSS Shapes Tests: Circle - invalid r values
Add the ref file.(Test case: Blending in a group with opacity.)
Merge pull request #339 from windtale/master

Add the ref file.(Test case: Blending in a group with opacity.)
Merge remote-tracking branch 'origin/master' into shiytan/box-sizing
Polyline with SVG background