Custom element creation constructor.
This constructor is used by the DOM when a custom element has been created. It can only be invoked by subclasses of Element from that classes created constructor.
class CustomElement extends Element { factory CustomElement() => new Element.tag('x-custom'); CustomElement.created() : super.created() { // Perform any element initialization. } } document.registerElement('x-custom', CustomElement);
Element.created() : super._created();
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https://api.dart.dev/stable/2.5.0/dart-html/Element/Element.created.html