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Emilio Cobos Álvarez authored
Much in the spirit of bug 1442207. They're not only unneeded, and cheap to get, but also we call them inconsistently with the light DOM and flattened tree parent (like ContentRemoved for display: contents), so they're really confusing, and kind of a footgun. MozReview-Commit-ID: 9u3Kp8Kpp5i
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