Placeholder is a tree-abiding pseudo-element, and as such it should support ::slotted, see https://github.com/w3c/csswg-drafts/issues/3150.
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/8735038d615f Allow ::slotted()::placeholder. r=heycam
Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/13985 for changes under testing/web-platform/tests
Upstream PR merged
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