[fxtf-drafts] [css-masking] Add mask-repeat-x/y

KuoE0 has just created a new issue for 
https://github.com/w3c/fxtf-drafts:

== [css-masking] Add mask-repeat-x/y ==
Latest spec: 
[https://www.w3.org/TR/css-masking/#the-mask-repeat](https://www.w3.org/TR/css-masking/#the-mask-repeat)

In this 
[discussion](http://lists.w3.org/Archives/Public/www-style/2014Apr/0188.html),
 background-repeat-x/y will be added to background-4. There is also 
already a spec [issue](https://github.com/w3c/csswg-drafts/issues/116)
 on csswg-draft.

As the counterpart of background, it also makes sense to add 
mask-repeat-x/y to the spec.



Please view or discuss this issue at 
https://github.com/w3c/fxtf-drafts/issues/99 using your GitHub account