Perhaps replace "useless" with "historical" (although the usage of it was meant to convey "has no use" it's apparently taken to mean useless' more informal derogatory meaning).
Link "get the parent" issue.
Explain why attachShadow() has the safelist it has.
(The IDL remarks don't have an issue, but they shouldn't be addressed at this level, as they affect all IDL standards.)
There's some useful commentary in https://github.com/w3ctag/design-reviews/issues/229#issuecomment-424390065 not all of which is captured by other issues. In particular:
attachShadow()
has the safelist it has.(The IDL remarks don't have an issue, but they shouldn't be addressed at this level, as they affect all IDL standards.)