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https://dvcs.w3.org/hg/innerhtml/raw-file/tip/index.html#dfn-concept-serialize-attr-value should also have these entries for proper roundtripping: U+0009 CHARACTER TABULATION with "	" U+000A LINE FEED with "
" (I think U+000D doesn't need to be roundtripped since the HTML serializer doesn't roundtrip it.) Also see https://bugzilla.mozilla.org/show_bug.cgi?id=169521
I think U+000D should be escaped too. Microsoft Edge generates decimal entities like 	 . Blink will follow Edge.