Coerce any input to a known provider, deriving it from the source if needed. 'generic' is the attribute's default rather than a claim, so a node that never named a provider still renders as the YouTube or Vimeo player its source points at.
'generic'
Optional
Coerce any input to a known provider, deriving it from the source if needed.
'generic'is the attribute's default rather than a claim, so a node that never named a provider still renders as the YouTube or Vimeo player its source points at.