Абстрактный метод setProperty

void setProperty(

)

Реализация

void setProperty(String propertyName, String? value, [String? priority]);

© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.19.6/dart-html/CssStyleDeclarationBase/setProperty.html