createElementUpgrader method
Creates an element upgrader which can be used to change the Dart wrapper type for elements.
The type specified must be a subclass of HtmlElement, when an element is upgraded then the created constructor will be invoked on that element.
If the type is not a direct subclass of HtmlElement then the extendsTag parameter must be provided.
Implementation
ElementUpgrader createElementUpgrader(Type type, {String? extendsTag}) { return new _JSElementUpgrader(this, type, extendsTag); }
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https://api.dart.dev/stable/2.13.0/dart-html/HtmlDocument/createElementUpgrader.html