Constructor instantiated by the DOM when a custom element has been created.
This can only be called by subclasses from their created constructor.
AnimateTransformElement.created() : super.created();
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-svg/AnimateTransformElement/AnimateTransformElement.created.html