The element is in the call‐for‐implementation phase.
+The element is in the call‐for‐implementation stage.
Usually, using the element is safe. However, it is a new feature so that it might not be implemented correctly. If it is found that the feature is hard or impossible to implement, the feature might be revised, or in some case it might be dropped.
-Elements defined by HTML4, Atom 1.0, and XBL 2.0 belong to this +
Elements defined by Atom 1.0, and XBL 2.0 belong to this class.
The element is in the last call‐for‐comments phase.
+The element is in the last call for comments stage.
The element is relatively mature, though the standardization is not done yet. It may be used for experiments. Since it is a new @@ -1666,6 +1666,6 @@ and/or modify it under the same terms as Perl itself.
- +