Report by dbaron https://lists.w3.org/Archives/Public/public-fx/2015OctDec/0021.html In short, mask-mode should not have a value called 'auto' since it makes parsing the mask shorthand ambiguous. For example, mask: url(xxx) auto You have no idea that this auto means mask-mode:auto or mask-size:auto

The CSS WG just (a few minutes ago) resolved to rename 'auto' to 'match-source'. (We also noticed that the definition for SVG images should really say to honor mask-type, not to just do luminance -- but there was discussion about maybe removing mask-type.)

Review commit: https://reviewboard.mozilla.org/r/36117/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/36117/

Change in this patch is very trivial. Waiting for test result.

Comment on attachment 8722595 [details] MozReview Request: Bug 1224424 - Replace mask-mode:auto keyword by mask-mode:match-source https://reviewboard.mozilla.org/r/36117/#review33059

https://hg.mozilla.org/integration/mozilla-inbound/rev/244ab4103b969298cc006d1459de0653344235dd Bug 1224424 - Replace mask-mode:auto keyword by mask-mode:match-source; r=dbaron