editorial: archive for wiki page "Text Separation attribute proposals"

Adds editorial note.

Part of #1882

documentation/archive/unresolved/Text Separation attribute proposals.md

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+**Editors Note.** Archived wiki page https://github.com/w3c/aria/wiki/Text-Separation-attribute-proposals, last edited Dec 5, 2018.
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+# Text Separation attribute proposals
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+From #699 These are the current text separation proposals
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+## aria-textseparation - https://github.com/w3c/aria/issues/699#issuecomment-415951739
+* none
+* textnode
+* space
+* leadingspace
+* trailingspace
+* inline
+* block
+
+## aria-whitespace - https://github.com/w3c/aria/issues/699#issuecomment-416096296
+* space
+* line-break
+* paragraph-break
+* none
+* inherit
+
+## aria-textseparation - https://github.com/w3c/aria/issues/699#issuecomment-420878301
+* 
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+## Add on wrapper rather than node - https://github.com/w3c/aria/issues/699#issuecomment-425131510
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+## 2 token value? - https://github.com/w3c/aria/issues/699#issuecomment-427040820
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