`mask-position-y` is not prefixed (as `-webkit-mask-position-y`)

[Bilge]

-webkit-mask-position-y is supported in just about every browser, but mask-position-y is not prefixed.

[ai]

Can you send PR with adding *-y here https://github.com/postcss/autoprefixer/blob/main/data/prefixes.js to save your name in the project’s history

Do we need to add also -x?

[Bilge]

Of course, it only makes sense to add both -x and -y suffixes.

[yisibl]

Please note that Chrome only supports the -webkit-mask-position-x/y side-relative syntax here. Currently, it requires enabling a flag and has not yet been shipped.

https://chromium-review.googlesource.com/c/chromium/src/+/6811401
https://chromestatus.com/feature/5073321259565056?gate=5093327095595008

side-relative syntax:

.test {
  -webkit-mask-position-x: right 30px;
}