Метод setProperty

void setProperty(String имяСвойства, String значение, [ String приоритет ])

Исходный код

void setProperty(String propertyName, String value, [String priority]) =>
    throw new StateError('setProperty not overridden in dart:html');

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-html/CssStyleDeclarationBase/setProperty.html