remove outdated phx-portal validation

Author: SteffenDE

lib/phoenix_live_view/tag_engine.ex

@@ -1607,14 +1607,14 @@ defmodule Phoenix.LiveView.TagEngine do
 
   defp validate_tag_attrs!(_attrs, _meta, _state), do: :ok
 
-  # Check if `phx-update`, `phx-hook` or `phx-portal` is present in attrs and raises in case
+  # Check if `phx-update`, `phx-hook` is present in attrs and raises in case
   # there is no ID attribute set.
   defp validate_phx_attrs!(attrs, meta, state) do
     validate_phx_attrs!(attrs, meta, state, nil, false)
   end
 
   defp validate_phx_attrs!([], meta, state, attr, false)
-       when attr in ["phx-update", "phx-hook", "phx-portal"] do
+       when attr in ["phx-update", "phx-hook"] do
     message = "attribute \"#{attr}\" requires the \"id\" attribute to be set"
 
     raise_syntax_error!(message, meta, state)
@@ -1627,19 +1627,6 @@ defmodule Phoenix.LiveView.TagEngine do
   defp validate_phx_attrs!([{:root, _, _} | t], meta, state, attr, _id?),
     do: validate_phx_attrs!(t, meta, state, attr, true)
 
-  defp validate_phx_attrs!(
-         [{"phx-portal", _, _} | _t],
-         %{tag_name: tag_name} = meta,
-         state,
-         _attr,
-         _id?
-       )
-       when tag_name != "template" do
-    message = "\"phx-portal\" is only allowed on <template> tags"
-
-    raise_syntax_error!(message, meta, state)
-  end
-
   defp validate_phx_attrs!([{"id", _, _} | t], meta, state, attr, _id?),
     do: validate_phx_attrs!(t, meta, state, attr, true)
 
@@ -1679,9 +1666,6 @@ defmodule Phoenix.LiveView.TagEngine do
   defp validate_phx_attrs!([{"phx-hook", _, _} | t], meta, state, _attr, id?),
     do: validate_phx_attrs!(t, meta, state, "phx-hook", id?)
 
-  defp validate_phx_attrs!([{"phx-portal", _, _} | t], meta, state, _attr, id?),
-    do: validate_phx_attrs!(t, meta, state, "phx-portal", id?)
-
   defp validate_phx_attrs!([{special, value, attr_meta} | t], meta, state, attr, id?)
        when special in ~w(:if :for :type) do
     case value do