1. csspositiontrydescriptors api: place-self

  2. csspositiontrydescriptors api: placeself

  3. css property: place-self

  4. css property: place-self: anchor-center

  5. css property: place-self: supported in flex layout

  6. css property: place-self: supported in grid layout

  7. css property: place-self: supported for absolutely-positioned boxes