https://treeherder.mozilla.org/#/jobs?repo=try&revision=3d1bc67f7660&selectedJob=23729841 INFO TEST-UNEXPECTED-FAIL | layout/style/test/test_value_storage.html | parse+serialize should be idempotent for 'mask: url(404.png) alpha padding-box border-box' - got "url(\"404.png\") repeat 0% 0% border-box add alpha", expected "url(\"404.png\") repeat 0% 0% add alpha" This is because default value of mask-origin changes from padding to border.

Review commit: https://reviewboard.mozilla.org/r/63754/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/63754/

Review commit: https://reviewboard.mozilla.org/r/63834/diff/#index_header See other reviews: https://reviewboard.mozilla.org/r/63834/

Comment on attachment 8770255 [details] Bug 1286337 - Part 1. Correct default value of mask-origin. Review request updated; see interdiff: https://reviewboard.mozilla.org/r/63754/diff/1-2/

Hi heycam, This is a side effect of bug 1258286, we need correct default value judgment in Decalration.cpp as well.

Comment on attachment 8770255 [details] Bug 1286337 - Part 1. Correct default value of mask-origin. https://reviewboard.mozilla.org/r/63754/#review60946 Looks good, thanks.

Comment on attachment 8770363 [details] Bug 1286337 - Part 2. Update initial_values of background and mask in property_database.js https://reviewboard.mozilla.org/r/63834/#review60948

Pushed by cku@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/3a8a8898431d Part 1. Correct default value of mask-origin. r=heycam https://hg.mozilla.org/integration/autoland/rev/b682d06315f8 Part 2. Update initial_values of background and mask in property_database.js r=heycam

https://hg.mozilla.org/mozilla-central/rev/3a8a8898431d https://hg.mozilla.org/mozilla-central/rev/b682d06315f8